-Aizen's group still has suboordinates in soul society to keep track on whats going on.
That's not entirely unlikely.
-Orihime ends up joining Aizen's group permenantly.... (brainwashed probably)
-Vaizards are actually evil/ Aizen's group is actually good
-Kurosaki's dad escaped with Urahara
Wouldn't be surprising
-The Key of the King is related to the kurosaki family.
-Ichigo's zanpaktou ditches him cause he went vaizard.
- Anime fillers are lame (is this a spoiler?)
I have laid my dreams under your feet;
Tread softly because you tread on my dreams.