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To begin with:Why? Other villains have done it before, Palpatine is one of them. Aizen. Why not MX?
Did Xigbar remember everything happen in his past after becoming a Nobodies?I do not know if MX planned out the whole Nobody situation, but I am sure he told Briag a few things just incase he did lose his memories. Who knows, maybe bbsv2 will explain what happened with Xehanort and Braig.