-Fighters scale to MH and the other God tiers. There is absolutely, 100% no reason for them not to scale.
-Scaling to the Creation Trio is legit. Ultimate makes it clear that Smash doesn't differentiate between the original version and the Smash version.
And also:
-Tabuu causing Subspace to collapse can work as a somewhat supporting feat. While the size of Subspace isn't mentioned, we know it's big enough to contain stars and shit and I don't really like acting like it's a small pocket world when it's more or less considered an alternate world to the main universe.
-While Galeem's feat was done through absorbing Master Hands, I still believe that the feat should scale to base Galeem. The Master Hands are clones created by Galeem's own power, not an outside power source. Given how Galeem does the same feat later on without any absorbing, I'd say that this is more of a feat needing time to charge. But that doesn't make it infinitely above base Galeem. So Galeem should backscale to his feat of destroying the universe. Dharkon also has his own feat of doing the exact same thing without any absorption.
-Galeem and Dharkon's feat is possibly 2-C. WoG implies Galeem might have nuked Bayonetta's alternate worlds too and Dharkon's World of Dark possesses two alternate dimensions. The main one and the Mysterious Dimension, both clearly cosmic-sized. If accepted, it should likely backscale to both again and thus make most chars Low 2-C, possibly 2-C (as the Low 2-C feats are casual, so no outlier here).
-As I said, let's not go over it yet. If that's literally needed to for the scaling here then you can say so.
-The first sentence gives no evidence. The second is huge AF, whatever makes you feel that way I'm gonna take a wild guess and say that there's no evidence for it. Yes they're the same as they games from which they come from, but the Smash version of that, will I need to later be pointing out differences in Smash to the original sources? That wouldn't be a fun activity.
-It can be mentioned on a list of feats for anyone scaling to it, but not in their AP. Sorry but you're talking out of feeling there, if it was "more or less considered an alternate world to the main universe" then the feat would be likely/possibly Low 2-C, but that was never a thing, no ill will while saying this but you just felt that way. If anything
Subspace being a weird place that Tabuu wanted to make bigger can be seen as suspicious in that regard, heck the stars could even be a result of the places sucked and fused into Subspace.
-I mean it's kinda like Esdeath absorbing her horse army, Galeem did them under who knows how much time, which we
could say it wasn't long..but then why did he make them just to absorb them? I don't disagree with the second time Galeem did visually the same being said to be the same feat (the wording just doesn't have to lie in the profile), but Dharkon doesn't have a feat like it.
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I went over that here (and probably in the other thread too), the Purgatorio thing is beyond unreliable and even if it was, there's no evidence of it being a universe, I didn't even know there were "alternate worlds". For the other stuff, before saying anything I would like to see how do you propose their AP should say and link?