I don't think anyone's complaining about it now, but I never got why everyone said it'd be impossible for Kenpachi (or other SS captains, by extension) to beat Noitora or some of the others present
I mean, the SS Arc had to have been a huge wakup call to them; five kids were able to break into the town and make a huge gigantic fucking mess of everything. In addition to the huge threat Aizen possessed, I'd imagined there was a lot of pulling up of slack (training etc.).
And plus; within every arc (which were all-in-all pretty short time-wise), Ichigo went through massive jumps in power. Hell even in this arc, which has probably only been 1 or 2 hours at most, Ichigo's gained a shitload of strength. Who's to say that Kenpachi and others couldnt've done the same (if not more) in the time between the SS arc and now?