My quick spoiler after looking at pics.
Aizen gets cut by shinji shikai. (yes thats right he takes damage and gives 2 wtf faces)
but figures out how it works after the first hit. (not surprised so did I)
then cuts Shinji in the back.
Tousen lives to say a couple of words then Aizen kills him. (With reiatsu, dude blows up like a bomb lol)
Ichigo shatters the the gate to FKT and comes up behind Aizen. (like Urahara does)