Board Thread:Improvements and Issues/@comment-5355747-20130313062554/@comment-10587310-20130721094901

Aizen did say he knew about Ichigo from his birth so maybe he did use Kyôka Suigetsu's power so they wouldn't be able to recognize Isshin. That way soul society wouldn't be able to take Isshin back. And that way soul society wouldn't have killed Masaki because they never found out about her hollowfication. Aizen didn't plan it per say but kinda just went with a cover up because he was curious about Masaki and her hollowfication. So he kept an eye on her and the rest of Ichigo's family. Even after she died. Because he was curious why Isshin didn't regain his powers after Masaki died. But I am probably wrong but it does fit at least in part.