That was a great chapter, plot-twist and fight (Yamaji is a badass no doubt.)
I haven't really said anything, although I did read lots of discussions wondering how other people think about it and I thought, heck, why not post something.
Anyway, back to the point:
Those... War potentials, Ichigo and Yamaji are obviously two of the five W.P.'s but aren't we forgetting people? Imo Ichigo's dad didn't really have a big role in this arc even though K.T. told us that he would explain more about him, shouldn't that be a reason to make him reveal his bankai? Or what about Urahara? He remained a mystery for me throughout the series, sometimes I had my doubts on him being a villian or just being shady.
I think there is a possibillity that Ichigo's dad is involved in this given the fact that 'there was going to be more information and etc etc etc about him'.
He taught Ichigo the FGT, he deserves something imo.