So the match-ups are somewhat set.
Seeing Kyouraku, Ukitake, Rose, Komamura and Byakuya serious like that was good and should speed things up. Soifon and Toshiro are paired up too it seems.
The fact that these guys even lasted a few seconds in front of these "Quincies", shared some words and got into fighting position means Aizen probably won't be necessary here. I mean Yama-ji and some other Captains havn't even appeared yet. (Or we could be trolled next chapter with Quncies 1hko'ing everyone lol)
Still though, I will patiently await Aizen, whether it's now, at the climax of the story or even the epilogue.