Even if he wasn’t busy doesn’t really matter, Naruto 635 thiis entire chapter is about the new era, im happy gamakichi is in, eventually he would take Buntas place anyway, hes such an old toad, ive been waiting for this. So if another summoned being of the same family or group is close enough in power they can actually take the place of the one being summoned.
Now the question is the substitution comoletely voluntary or is it partially voluntary or at a first come.first serve basis? (like a equally powered creature can be the first being “in que” for thatlevel of summon. Very well. Yes I have thought about it. My thought was far more considered when compared to what some people put into their comments before thoughtlessly lancing the swollen boils of fetid pus occupying their otherwise long-vacated brain pan and then randomly flailing their fingers over a keyboard to manifest the resulting ooze (see your comments for shining examples).
As I always say, everyone eventually agrees with me. It just takes some of the slower ones longer to figure it out. Bijjudamas are the most powerful attacks in the manga. Bar none. Obviously combining a bijjudama and Amaterasu would be incredibly powerful – arguably far more powerful than FRS. Derp. All he said after his pow-wow with the Hokages was that he was going to save “the village”.
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