Originally posted by: naruto22
5) Aizen decides that he can't afford to mess with Unohana since he needs to get the Hogyoku from Rukia ASAP. So he delays Unohana with the story and waits for Tosen to capture Rukia. Then get the hell out of there rather than get into a messy fight with Unohana.

i go with point 5. But for some reason, everybody is so set in their minds that nothing in 4th Squad can be powerful, even their captains.

Well, here's another food for thought: who is a better killer? a soldier or a doctor?
A soldier obviously.

I'm gonna go with my theory of Unohana being with Aizen (or at least manipulated by him), anything else would be a plot device as Terra put it, in which case it would ruin Bleach's excellent reputation.

Why would Aizen bother to attack Hina and Hits and the just let Uno and Kotetsu live to heal them and warn everyone?

If he didn't want to waste time, then why did he stand there talking about his plan with Uno? He could have used that time to kill them.

If he was afraid of Uno's strenght, then yet again why did he spill his guts? He could have just teleported out of there.