User blog comment:Shinitenshi/Has Aizen Ever Lied?/@comment-43000-20130813230823

"The name of that cursed man is Toshiro Hitsugaya" can in fact be a double meaning used to set up a self-fulfilling prophecy. It's been theorized, I'm not sure where exactly, that Aizen is Hitsugaya's Shadow Archetype because Hitsugaya got out of isolation by being too strong by what can be perceived--surprisingly easily--as luck, and that riddles Aizen with (though subtle) envy.

I'd be willing to bet that Aizen really hates Hitsugaya.