[[WMG/MarioAndLuigi Click here]] for WildMassGuessing for the series as a whole.
[[WMG:Bowser was [[ObfuscatingStupidity Obfuscating Stupidity]] the entire time.]]

Bowser wasn't suffering from Amnesia at all. He knew full well he inhaled and swallowed up everyone. He was pissed. It was [[DisproportionateRetribution Disproportionate Retribution]] for everyone continually thwarting and defying him. The Mushroom Kingdom is his, [[IfICantHaveYou which includes its inhabitants]]. When the means to punish them for [[GetOut kicking him out]] presents itself via Fawful, he rampages right back there. With them in his possession, Bowser had no intentions of interacting with the Marios, lest they escape and start screwing up his plans again. [[YouWillBeAssimilated Leaving them to the mercy of his body]]. When Fawful initiates the next stage in his scheme to revive the Dark Star, he abducts Peach from the Koopa King's fat gut, he rages '''"Put her back!"''', [[FakingAmnesia revealing he knows what he's doing]].

This makes their escape in the ending all the funnier, Bowser claims he's disgusted the Marios (he didn't care about the Toads) were inside him the whole time, [[GuiltyPleasures unwilling to admit it was his own deliberate intention all along]].

[[WMG:This iteration of the Mushroom Kingdom was the world "rebuilt" in ''VideoGame/Mother3''.]]

Midbus's pigmask insignia serves to suggest he is a Chimera

[[WMG:The [[EldritchAbomination Dark Star]] is a Star Sprite modified by [[VideoGame/MarioAndLuigiPartnersInTime Shroobs.]]]]

I just saw this on the Mario wiki. Makes an odd sort of sense.

[[WMG: The final battle took place in Bowser's heart]]

It's a very minor note and there's no evidence to say so, but it does make sense considering the [[WombLevel theme]] of the game.

[[WMG:The broken red pipe led to Plack Beach or Bumpsy Plains.]]

It seems logical because those are the only major areas that don't have a pipe leading to them in-game and there aren't many other places for the pipe to go. The only question is where the other red pipe is.

[[WMG:One of the pipes leading to Blubble Lake was originally going to go to Plack Beach or Bumpsy Plains.]]

But it was changed at some point in development, likely because of how large Blubble Lake is and how small the other two areas are by comparison.

[[WMG:The Junker boss is a prototype that was in the trash because of how glitchy it was]]

The Junker robot is an early model of a robot (Likely a Jailgoon, Mechawful, or a Dark Mechawful), or a new robot that was cancelled altogether, that was discarded because of how uncontrollable it is and/or because newer versions were developed, but Midbus liked it and gave it a trash can as armor because it was thrown away before it could get real armor. The Junker Cans are just regular trash cans, but are controlled by the enemies inside it. The Junker Cans that don't have any enemies in them are actual robots that were confused with trash cans, hence the garbage inside them, or they were given trash to make them more like real garbage cans. It's also possible that the Junker Cans were part of some automated trash disposal service and were in the trash either dropping off garbage or because they were thrown away.

[[WMG:At the end of the game, [[spoiler:Fawful didn't die]]]]

[[spoiler:We already know that he has access to soul-containing technology from [[VideoGame/MarioAndLuigiSuperstarSaga the first game]]; what if he designed a device to collect his soul should he die? Then, in ''VideoGame/MarioAndLuigiPartnersInTime'', we see Fawful collecting beans for some unknown purpose. What if he used those beans to create a backup body for himself? Given the wackiness of the Marioverse, it's not that unlikely that Beanish folk are actually made of beans. Though he's an Engrish spouting goofball, he's also smart and dangerous enough to conquer the Peach's and Bowser's castles by himself and almost bring about TheEndOfTheWorldAsWeKnowIt. Surely Fawful is smart enough to have some sort of backup plan. So, when he exploded, his hypothetical device would hypothetically attract his soul like a magnet and then put it in his [[RuleOfThree hypothetical]] artificial bean body!]] It makes perfect sense, kinda!

[[WMG:The Dark Star is an artifact of the Ancients in the ''Franchise/{{Kirby}}'' franchise]]

Considering an image of it appears on [[spoiler:the Lor Starcutter's sail during the fight with it and Magolor]] in ''VideoGame/KirbysReturnToDreamLand'' and that it carries the star motif (albeit in the ''Mario'' style) and is so hugely powerful like so many other Ancients-linked artifacts, it seems plausible the Dark Star originally crash-landed in the Mushroom Kingdom from ''Kirby'' territory.

[[WMG: Bowser Jr.'s Journey will expand on the Elite Trio's defection to Fawful]]

To the point where it reveals what made them decide that it's an "extreme error of judgement" to trust him.

[[WMG: Midbus will be the main antagonist of Bowser Jr.'s Journey.]]
Much like how Fawful served as the main villain of ''VideoGame/MinionQuestTheSearchForBowser'', we might get to see more of Midbus in Bowser Jr.'s Journey. Perhaps the game will end with Bowser Jr. unfreezing Midbus somehow and having one last battle with him.

[[WMG: Popple and/or Prince Peasly will return for ''Bowser Jr.'s Journey'', akin to how ''Bowser's Minions'' had characters from ''Bowser's Inside Story'' appear]]
Fawful is the Big Bad of ''BIS'', yet he never mentions the Beanbean Kingdom in the game at all with what happened in ''Superstar Saga'' never really mentioned. A way to hint at Fawful's first appearence is to include other characters from it, especially the talking beans.

Popple can be a boss for Jr.'s mode, getting into battle with him somehow. Peasly can be vacationing (like Starlow before him) in the Mushroom Kingdom where he comes across Jr., one thing leads to another and he ends up tagging along on Jr.'s quest (possibly out of an {{Enemy Mine}} situation against Fawful).