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Fair enough, I keep forgetting that he writes about Mickey as well, despite the fact that he didn't have the conversation with him. Xehanort listened to the conversations between Ansem and Mickey and then wrote as if he was part of them.
To be fair, Ansem the Wise did notice the diaries that were written at the time. From Ansem's Secret Report #2:
So Xehanort wrote the Diaries up until number 8 before banishing Ansem The Wise, so I stand corrected: in a way, he thought of himself as "Ansem" before putting his plan in motion.
And... I guess Ansem was banished before he could lock Xehanort in an asylum?
TBH the fake Ansem the wise plot was my favorite reveal in the series. The line where he calls Xemnas's efforts in the World that Never was a monument to ignorance still stands out in my mind.
Honestly after playing 3D I'm confused why he even took Ansem's name in the first place.
I don't really see how it could have been an identity crisis since 3D revealed that he never even lost his memory and he was self-aware of who he was (then again maybe it was Braig assuming things...? I don't even know anymore honestly). Was it all just to spite him?