first part, The argument they had could’ve been about elder Kai’s special power which would make sense and leave no contradictions, leading to the same events. Instead of instantly discrediting things simply bc they don’t line up at first glance, try actually putting together to the pieces to make it connect. Idk why the possible of that never occurred to you and you just instantly assumed elder kai is wrong.
Also just in case you try to say this “the argument was trifling so it was unimportant and elder kai ability is important” okay cool, there’s no proof his ability actually had a lot of importance and the ability could’ve simply had little value outside of their argument and only be important to the two of them. Making it overall, a argument about something trifling.
“It was important bc beerus was afraid”
First, you can’t substantiate that at all, that’s really all there to it. The second refutation I used “and the ability could’ve simply had little value outside of their argument and only be important to the two of them. Making it overall, a argument about something trifling.” Can be applied here as well, just replace elder Kai’s ability with beerus fear.
for the second part about beerus destroying the KAIOSHIN realm, you don’t even give a real counter argument to that, you just “here are two possibilities” which is interesting since suddenly now he can see other possibilities when you couldn’t in the first part but besides that, you never outright pick a side nor argue for why one of the possibilities is more likely than the other, nothing to refute here.
“Since when was goku blah blah blah” goku isn’t going off his own knowledge like you assumed I’m pretty sure. He’s going off the knowledge he heard from the Kai’s, the people who actually has validity in this situation. Goku has been told multiple different versions of buu can destroy the universe or was destroying the universe and he simply assumed the same for kid buu. Also he sensed fat buu and piccolo stated shin was right about buu and universe was going to be killed, goku could obviously sense kid buu, who’s above fat buu so he can simply put 2 and 2 together.
You thinking it’s “flowery language” does not disprove anything
Vegeta request doesn’t disprove anything, read the manga, Enma confirms Goku also took energy from the afterlife, disproving that it’s only from earth like you think.