I'd have thought Ahsoka alone might be enough to help Rebels out, though in all honesty I don't believe they as a faction need to be 'helped' - since the death of the Torpedo Boats Rebels have been doing just fine, from what I can tell.
As in every wave, the things that seem scary and game-changing now probably won't be by the time we get them on the table - theorising in advance will never replicate the tabletop. Boba Fett crew is a good example, as is Quickdraw (firing in the Activation phase whaaaa?).
I'd worry about it when Wave 10 hits, and not before.
