Wrong, he was controlled since the beginning of the fight. This was before he was Amaterasu'd by Itachi.Wait.... Kabuto didn't control Nagato until he was Amaterasu by Itachi, so everything before that was Nagato.
Mo one is making this excuse. You just brought it up. :|
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OT: I don't know who argued with you otherwise on the fact that Kabuto doesn't know how to use all 6 Paths of Pain.