User blog comment:Godisme/The Fire 2/@comment-1604252-20120907041005

Well, I don't really agree with the idea of Ichigo and Old Man Yammas bankais not being sealed because they are compression types. A bankai is a bankai regardless of what type it is, so I don't think its fair for them to not have theirs taken just because its a different type. But that's just my opinion. I'm going with the theory of Ichigo having some hollow in him, or possibly because of the secret significance of his birth that hasn't been revealed yet. Maybe some relation to Isshin possibly. But it's all just speculation for right now.