No.12328952 ViewReplyOriginalReport
Ok, obviously Turn Back the Pendulum occurred more than 100 years before the main story line. Here we see Urahara going to fight against Aizen, who just turned a lot of SS's Captains and Vice Captains into Hollows/Vizards.

Urahara knows Aizen is up to something, so why doesn't he tell the rest of the gotei 13? Lolplot