There's also the fact that Sasuke suddenly used amaterasu on B. Why didn't he use it before? Answer: he didn't train for it and didn't have it, so it developed automatically when under emotional stress. It was clear that he didn't train for amaterasu and was just experimenting with his MS.
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I didn't claim you were discrediting Naruto, I'm just pointing out the differences as I see them. I'm not angry at all actually. Just having a debate.