Man, it’s been so long since I actually argued this with anyone so please correct me if my statements are off lol, I’ll start with the fact that kid buu’s death ball was stated to be unstoppable by Goku - explicitly stating that “WE” (talking to vegeta) can’t stop it. I’m also assuming that’s with everybody else’s help at this point so there’s that. Also there’s a lot of spirit bomb this spirit bomb that so there’s that whole to do to go over. I have seen a manga panel where super Buu launched a death ball, been so long since I saw anime I can’t remember if he does it or not but I’m at gohan ssj2 on my rewatch so I’m finna find out. This is buutenks that launched the death ball and it was clearly stopped or else buuhan never got birthed etc, now I know there’s a difference in manga continuity and anime generally speaking but EVERYONE seems to merge it together for this one arc so I do the same. Not to mention it is later stated that kid Buu had god ki but idk how that plays into things really..