G-Stones are crystalized Spiral EnergyThey're the same shade of green, they react to emotion (courage is just fighting spirit by a different name), they have limitless potential. Not much of a stretch here. Similarly, J-Jewels are also crystalized spiral energy tinted red by the Red Planet's manufacturing processes. Guy's Evoluder form is a human body that has become capable of consciously harnessing spiral power—a prequel to humans as we see them in TTGL—hence the "holding GaoFighGar together by force of will" scene in FINAL.
G-Stones are made of Thiotimoline.The determination-activated spacetime-warping properties of the G-Stones are consistent with those described in Dr. Isaac Asimov's The Micropsychiatric Properties of Thiotimoline.
Everyone alive at the Bittersweet Ending of FINAL survives.There is one more Gadget Tool mentioned in the Genesic GaoGaiGar eyecatch, called the Galeoria Road. From what we know of the Galeoria Comet, this would probably create a massive ES Window through which everyone could escape the collapsing universe. So Everybody Lives, And the Adventure Continues with the GGG crew Walking The Multiverse. Further evidence: The very last frames of FINAL are a shot of the thought-destroyed Galeoria Comet. Make of that what you will.
Kouryu and Anryu both suck at landing.I've had this idea in my head ever since the scene where they both crash in Final Episode 7. True, it was because they were falling from space, but what if that scene was telling us something else. Consider that Kouryu has trouble stopping in space, and Anryu does the Traditional Ryu sibling faceplant in Super Robot Wars. It would be funnier cause it breaks the usual pattern.
Hana was being targeted, either covertly or actively, by the Zonderians.It may be more than just unfortunate coincidence that she was in pretty much every location that Pasder and the Machine Kings attacked, even when it was outside of G-Island City. They knew that Mamoru's power to Purify their creations was a huge threat to them, so getting rid of him was a high priority. If they were aware of their Toy Ship status, she'd be perfect bait for drawing him in for them to eliminate. (This troper can only speculate how much of a disaster it would have been if they'd ever made her into a Zonder...)
The GGG crew returns to earth 8 years after FINAL endsGiven how we learned during the final episodes the comet itself passes Earth every eight years, they just have to hold out until the cycle starts again. Then when they return, they have to save Earth from yet another threat.
Galeon is the reincarnated form of MufasaMemetic Badass Papa Wolf King of Beasts. After overseeing that his son Simba reclaimed The Pride Lands, Mufasa allowed himself to enter the cycle of reincarnation and was later resurrected as an even more Badass Humongous Mecha, going by the alias of Galeon. He watches over Mamoru because he reminds him somewhat of his own son, and has allied with humanity For Great Justice!
Mic Sounders the 13th was going to be a traitorAfter having just saved the team from getting destroyed, Cho Ryu Jin takes the time to look up at him suspisicously before saying how he doesn't trust him. It isn't a dynamic that is played up in the interaction between the three of them, and it is never really brought up again in the story. But it's weird that they would say that about Mic out of the blue. Mic is also seen basicly spying on the team and relaying information in the series. Of course it wasn't what it seemed, but I think somewhere along the line he was supposed to turn, but they changed their minds.
The J-Jewel on hope Hopeit is never explained why J fell to the zonderization, even tough the J Jewel was shown to be able to resist it. but if you look closely at the flashbacks, you realize that J Had given up Hope when he was zonderized. And the reason he started to resist the zonderisation later in the series, was because Guy and GGG's fighting spirit made his hope return.
GaoGaiGar disassembles in between uses because......The Gao machines are easier to maintain while separate, Galeon wouldn't be able to move by himself when in GaiGar mode (and would thus prefer his default form), and/or Guy can't exit GaiGar except by allowing Galeon to return to his normal form.
Mamoru was originally intended to pilot Gaogaigar.Near the end of the TV series, Guy, on the brink of death, has a conversation with Cain, the creator of Galeon and Mamoru's real father. During this conversation, Cain states that he was the intended pilot for Gaogaigar; presumably, he sent Mamoru away with Galeon when it became clear that defeat was inevitable, and he stayed to fight to the last or something of that sort. Besides Purification, Mamoru's abilities mirror Gaogaigar's to an extent: he raises his left hand to generate barriers, just like Gaogaigar's left hand produces the Protect Shade (though the hand gestures are different), and Mamoru even uses a similar ability to Hell and Heaven at the end of the series to destroy the Z-Crystal. We can assume from this that his right hand contains more destructive effects (the "Broken" side of the equation), but Mamoru is more interested in protecting his friends and family than actually fighting. In any case, from what we see in FINAL, Mamoru is capable of piloting Gaogaigar, but requires the Pas-Q Machine to do so. It's worth noting though that both repli-Mamoru and repli-Galeon aren't 100% identical to the originals (Mamoru's aura is blue instead of green, and Galeon is gray), and the Pas-Q Machine, which seems to greatly amplify Gimlet's abilities in the first episode, only allows him to fight evenly with Gaofaigar. So unless Gaofaigar is much, much stronger than the original Gaogaigar (possible but unlikely), it's not too much of a stretch to believe that the copies are weaker than the originals. We also see Pei la Cain in action, and his abilities seem to be similar to Mamoru's: green aura/pink wings, barrier projection, some form of destructive power, and from the latter two a Hell and Heaven-style attack. So when we put those two facts together (Cain was the original pilot for Gaogaigar, and he and Mamoru have similar abilities), it suggests that Mamoru, on his own, was meant at some point to pilot Gaogaigar. However, when Guy was rebuilt as a cyborg, Galeon instead chose him as a pilot for two reasons: Mamoru's lack of experience with his powers, and Guy's sheer Hot-Blooded-ness making him a better warrior. By the end of the TV series, despite Mamoru's growing powers,, Guy still has more experience fighting with Gaogaigar, and switching over to the inexperienced Mamoru could've hampered their efforts against the Primevals. There was time during the Time Skip for Mamoru to learn how to pilot Gaigar, and repli-Mamoru might've been drawing on that when fighting Gaofaigar, but again, Guy's experience and Hot-Blooded-ness made Galeon choose him over Mamoru when fighting the Masters of Sol. But if the situation desperately called for it, Mamoru could step up and kick ass if he had/wanted to. A related WMG: Mamoru-piloted Gaogaigar would've been much stronger than Guy-piloted Gaogaigar. Why? Mamoru can power up G-Stones with his abilities, so he could amplify Galeon's GS-Ride whenever he wanted; in effect, it would probably be a mecha-scale version of Guy's Hyper Mode. Guy wasn't able to handle Hell and Heaven because, if this theory is correct, Galeon was designed to work with a different pilot, so Mamoru could probably use Hell and Heaven with less or no consequences. It's also possible that Gaogaigar's Broken Magnum and Protect Shade attacks could've worked in tandem with Mamoru's natural abilities, making them stronger as a result (and further boosting Hell and Heaven's power). Finally, since he has to be near the battle to use Purification anyways, if he were piloting it, he might've been able to Purify Zonder cores while still pin the pilot seat.