Elder Kai interrupted Kaioshin and asked if he turned into Fat Buu after absorbing South Kaioshin ? As a matter of fact no , he didn`t . He asked him if the buff form they saw earlier was the form Boo attained when he absorbed South Kaioshin , in which Kaioshin replied Yes .
I used a crappy fan translation for that statement, since it was more accessible than the alternatives, so you might be right about that quote...
Then he talked about how absorbing Dai Kaioshin brought Buu under control , and at this point Kaioshin was done in talking about Dai Kaioshin . And then Old Kaioshin makes the remark that this Boo is the most troublesome from the beginning , in which Kaioshin replies yes , and that his power decreased with absorption .
So...? That's exactly what I said. He makes the comment about absorption just after talking about the last absorption.
The word "absorption" doesn`t have a plural in the Japanese language , because it reffers to the concept of absorbing .
Most Japenese words have no plural, usually. There's nothing special about "absorption"'s lack of plural.
As a matter of fact , the energy was used directly to powerup Majin Boo . And what means are you talking about ? Every damage inflicted from one of Babidi`s henchemen to another person makes Buu recive that person`s energy (proven in the fight that Goku had against Majin Vegeta) , so if the energy can`t be used to powerup Buu it means none of the Kaioshins did .
And as a matter of fact it says about Kaioshin`s energy itself and Majin Buu . They say they can`t use Kaioshin`s energy to revive Buu . Get your facts straight .
Fact 1: Majin Buu itself isn't the one absorbing that energy, considering later battles show he has no way to absorb remote energy, he's only receiving it.
Fact 2: It's stated that they can't use Kaioshin's energy to revive Buu, nothing about the nature of Kaioshin's energy being incompatible with Buu.
Everything that means is that Kaioshin's energy can't be used by the method of remote collecting. It says nothing about Buu's compatibility (or lack of) with Kaioshin's energy.
What exactly would be the point in introducing Buff Buu in the transformation from Super Buu to Kid Buu if he would be useless to the story ? Why would Buff Buu be made stronger than Super Buu if South Kaioshin is truly the source of Super Buu`s power ?
Dai Kaioshin still was in Super Buu, but Buff Buu was completely unrestricted by that influence, so, he's stronger. However, after Buff Buu loses that remaining power and reverts to Kid Buu, he becomes weaker, creating a final villain which Goku could fight directly and have some hope of beating.
And since Good Buu was nore more directly connected to Kid Buu , his power was that of South Kaioshin and Dai Kaioshin . He was practiclly a combination between them . If you think about it , Good Buu and Kid Buu exiting is actually a paradox .
So you agree that Good Majin Buu uses the Kaioshin's powers? That means that Majin Buu can use their power, and contradicts your own theory. Buu is Buu, after all.
You speculate that Buu can't use the Kaioshin's energy, even though there's a canon example which clearly shows a Buu directly using their powers.
Besides, after they defeat Kid Buu, they even talk about the possibility of Good Buu creating yet another Evil Buu and starting the whole trouble again, and how they'd need to train to fight if that ever happened. Considering Good Buu isn't responsible for Kid's creation, they can only be talking about the Gray or Super Buus, not Kid.
And Rocketman didn't need to withdraw back his statement on Cell, he witnessed Perfect Cell and he still thought he could won.