Ichibei specifically mentioned "humans". Which shinigamis are not (anymore), maybe he meant ichigo's friends trying to help hum. Or perhaps he meant it like "there's no hope for you, only a godlike being can beat him". That surely opens space for a probable aizen-ichigo duo.
I wonder what urahara intends to do. I can't see the captains defeating any of the elite guarda as they are now, much less standing up against bach. I'm thinking of some kind of sacrificial kido or something, to at least weaken him. Still anxious about the kamikake thingy which ukitake talked about. Bleach walks slow (VERY slow) but i can still enjoy it anyway despite kubo being a Little retard with stuff sometimes.