Aizen had every intention of killing them after they were hollowfied, only reason they are still alive is because urahara showed up. I Doubt they are about to serve Aizen. Though i do agree, it is odd that SoulSociety are relatively holding their ground, typically they would be the underdog before reinforcements show up. (Though Renji and friends may need back up against Yammy :p). Finally shown Soi Fon's bankai, i have to say it was rather cool (Was almost inspired to draw fanart, but lately been to lazy to draw anything). On another note whats with her VC (the fat dude), at his rank you'd think he would be able to perform atleast a lvl20 kidou >.<