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Don't worry.

I'm sure these guys have some BS third-release of their Zanpakuto that Ichigo's then going to learn in some training montage, possibly outside time itself, and that's going to make everything better.

Also, since these guys are stronger than the 13 Divisions combined, and supposedly the Arrancar were stronger than the 13 Divisions combined, and the Arrancar were pretty easily trounced despite being stronger than the 13 Divisions combined, I conclude that these five probably aren't that big a deal.