Question about Grand Supreme Kai and South Kai?

If they were able fight full power Moro 10 million years ago, then why weren't they able to easily destroy Kid Buu?

Well, he did give up most of his power to stop Moro

DaiKaioshin gave up "most of" his Godly power to beat Moro. So that explains why he couldn't stop Boo millions of years later.

As for South Kaioshin: we don't have any surrounding context to work with, as he wasn't shown actually fighting against Moro at all. For all we know, Moro could have been allowing him to live for the lulz. /shrug

Also Moro only grew stronger after absorbing planet after planet. And Buu absorbed the two Kais because they were stronger than him. He doesn't absorb weaker things.

Yeah, that's true. Boo wouldn't absorb a character unless they were at least very close to his existing level.

So based on that, it's logical to assume that South Kaioshin ~/> original Pure Boo, and DaiKaioshin ~/> Buff Boo.

And somehow DaiKaioshin turned Buu weaker while also making him less destructive.

Bad Buu transforms Grand Supreme Kai into the chocolate and absorb his god power. But Grand Supreme Kai and South Kai can not absorb Buu

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