It’s directly stated Gohan’s ki was being pulled, and we know it’s suppose to be taking a lot of power since it drains people. Planets don’t have ki, they have another energy that’s usedYea there's a difference between the king ki dama and Goku ssj3.
King ki dama literally could also use multiple planet's energy during the frieza saga doesn't make frieza multiplanet level.
He says this at the very end of the fight. After Gohan and everyone else was aliveYes because Gohan was already dead from being blown up and unconscious. If SS3 Goku was enough to beat Kid Buu, Ultimate Gohan would have done it effortlessly.
There’s a bunch of factors to thatNo
Super Buu even on his own, Goku admit he’d be killed trying to fight directly
Compare that to how lax he and Vegeta are against Kid Buu, where it’s stated twice Goku’s Super Saiyan 3 would be enough to kill Kid Buu if he could sustain its full power
1) Goku was still keeping up the lie that he can’t beat Buu
2) Goku regrets that he didn’t fuse in the very same page you posted
Though honestly it doesn’t matter if Goku is stronger than Gohan and Super Buu or not. Kid Buu is clearly stronger than all three of them
The anime had SSJ1 Goku deck Buuhan in the faceThe anime is even worse. You got Vegeta and especially Goku at just SS2 giving Kid Buu a fight thanks to scenes added in.
Manga has Vegeta getting laid flat in seconds and Goku going straight to SS3 against Kid Buu since anything less is worthless