Headscratchers are questions that remain after you're finished with the work, so all spoilers are unmarked.
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Just... how?
As of Episode 13, we learn that Eldora is not only a real place, but is also a planet 30 light-years away from Earth. So how in the hell did Mobile Suits and the like end up there, and how do the heroes turn from their digital avatars to real beings there, and how is Freddie even able to summon them? For that matter, how does Freddie even know about the Build Divers?!
- Eldora seems to have had an extremely advanced civilization in the past since the Kill Sat's effects could reach Earth. From what Alus said in episode 11, the original people were driven away in some event, with Alus put in charge of the planet until their return. Either he's degraded since then or the people failed to return who knows, but the furry people have developed in the interim, and they've learned a bit of the original civilization. Somehow, Freddie can interact with the remaining tech, in this case a teleporter. Given its range, he can just barely break into the most advanced system on Earth, the GBN system, which is massive enough to create both a lifelike VR environment and AI beings like Sarah, Eve, and May. As for how the Divers materialize as their avatars, that's where things get weird: as their GBN data is sent through space, it's possible the data accumulates energy. As Einstein states in his Theory of Relativity, energy and matter are interchangeable
. Once the data and energy reach Eldora, the teleporter uses the GBN info as the guide to shape the Divers into their avatars. As for the Mobile Suits, May said Masaki is an S rank Diver, so we can assume Alus studied the data from his GBN stats. And before anyone brings up time-related questions: according to May the effects of the Kill Sat might've hit Earth at faster than light speed, so events on Eldora aren't somehow happening 30 years before the events of the show but in real-time. - We can now answer that last question as of Episode 14 in the new season.Freddie's stone interface to contact the crew operates by touch; he was reading some kind of book that described how to do it (not that he was particularly good at understanding it). Once he first got it working, it activated a set of screens that showed him the events of the Build Divers fighting to save Sarah, so he witnessed their gallantry and heard their force name, ascribing "Build Divers" to a brave and powerful set of "Creators" that could give hope to his home. Unless he happens to be TERRIBLE with human faces, he doesn't seem to have expected the ACTUAL Build Divers to answer his distress call.
- Episode 15 provided some more information: when the Divers and the MS materialize, the ruins utilize a material Freddie calls "Shining Sand" to reflect their GBN data.
- Episode 17 further reveals that the summoning system Cuadorn and Freddie used is actually the remains of a digitization project the Ancients left behind, where they intended to transfer themselves instantaneously through digital space back to Eldora once the planet's ecosystem recovered. While looking for a way to fight Alus, Cuadorn inadvertently connected this digitization system to GBN, linking Earth and Eldora together. That's how Masaki and the Bulid Divers were summoned to Eldora, and how Alus gained the data needed to copy Gunpla designs.
- Not sure that any of this explains how they are able to get rewards and points from their missions on Eldora. We even see that they can review fight footage that would be from in-game cameras.
- The real world answer is that the show was treating Eldora like a GBN level early on to build up the big reveal, and fight footage being done with pre-existing animation because it's cheaper to produce. In-Universe is another story, but with how much Ancient Eldoran tech factors into GBN's makeup, they system still treats the incoming data as genuine gameplay; the fight footage could be generated by the Eldoran system re-interpreting the machines' sensor data as gameplay footage.
So what happened to the book?
We learn in Episode 14 that Freddie used a book to learn how to interact with the temple (not that he was good at reading and understanding it). But after he gets the attention of the One-eyes the BUILD DiVERS first fought in Episode 1 he losses it. So... What happened to it?
- It will turn up later for sure, though it's a toss up which side will find the book.
- Okay, as of the final episode the book is still missing, so it looks like it didn't matter after all.
Hiroto's head injury
With all the explanations of the interactions between GBN and Eldora taken into account, how does Hiroto's head injury in Episode 9 (against the aquatic One-Eye) actually end up injuring his physical body in reality (as seen in Episode 10)? Masaki's situation is different because it's an issue of his body wearing itself out due to all the excessive fighting he's forced to do while under the control of Alus and his physical body is otherwise fine, essentially reflecting the kind of state his body would be in if he were actually logged in for the entire time that he's been in his coma. Meanwhile, for Hiroto, the explanation about the mirror sand recreating all of GBN's systems and such doesn't explain how his body could be physically damaged when anything that happens to the mirror sand should at worst be treated as taking an attack in GBN.
I guess what happens to Hiroto is consistent with how the Build series presents the nocebo effect like with Sekai in GBFT, but it feels off, if only because it's the only example of someone being physically injured through VR (Eldora or otherwise) in the series.
- The original series establishes that people with disabilities experience full freedom of movement in the game, as we see with Par. GBN may have safety measures to prevent harm normally, but the feedback coming from the set up on Eldora is just enough to get through those safety measures, as GBN's done things it wasn't designed for before when it created Eve and Sarah.
Satellite cannon's second shot
So the first time Alus fires the satellite cannon, it wipes out Seguri and the resulting shock-wave knocks out communications over on Earth. However, the second time, it clashes and eventually loses against the Re:Rising Gundam's Grand Cross Cannon and the cannon is destroyed as a result. How did having more than twice the firepower of the first attack not result in any kind of noticeable communications disruption on Earth the second time? Was the beam hitting Eldora's surface what triggered the disruptive shockwave rather than the cannon itself being fired?
- It's most likely that the after effects were canceled out by the Grand Cross Cannon. It's also possible that the final battle was over so fast a second blackout didn't hit until afterward, since the original blackout effect took hours to hit earth, and we don't know how much time passed between the battle and the discovery of the Alus El-Diver.
- Another possible reason is that the second shot didn't hit Eldora. The blackout may have been a result of the shot hitting the connection point itself (Eldora proper), and traveling back along the connection path to Earth. Ergo, if the blast doesn't hit the planet, there's no feedback to Earth by way of GBN, and thus there's no blackout
