User blog comment:Godisme/My Take on Isshin/@comment-452405-20100328044137

Thats a pretty good theory. You definitely show the way Aizen could've planned everything out and include Isshin into things without creating some outrageous prediction.

Ichigo's fights with Renji and Byakuya could've been orchestrated easily enough as they were the ones sent to the real world to get Rukia back. Renji and Byakuya's relationships with Rukia alone would've determined they fight with Ichigo as long as they met and learnt of each other existence.

Kenpachi's, Grimmjow's and Ulquiorra's fights were simple enough to make happen as all you had to know was their personalities would've driven them to seek out Ichgo.