Thread:DazzlingEmerald/@comment-25579547-20141212144801/@comment-25579547-20141213064809

Yep! It has something to do with Alvin's age. When he was still a seated officer in the Fifth Division under Aizen, he was close to the man. And because he was young, the youngest among all in fact, he could not figure Aizen out more than anyone (example: A seated officer could figure out that something sinister is behind Aizen but still doesn't know what it is, whereas Alvin couldn't see that sinister stuff). Due to this, Aizen thought that he would be clueless of what happened and experimented on Alvin with, yes, the Hogyoku.