i assume since they both unlocked at the same time, since kakashi passed out right after, he suppressed the memory, like how sasuke unlocked his sharigan the night his brother massacred the clan but he passed out and didnt unlock it again till he was older.
least that would make sense to me, im sure others are....nope PLOT HOLE!....but having rin be a double agent is pretty cool. gives the reason why kakashi killed her justified instead of silly....oops the mist was blinding.
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