Thing is, there's a good chance that Starkiller Rey has a new super Leader ability like CLS did, and then do you think the rest of Resistence will really be that good?
Finns zeta is what makes them amazing in PVE, but I could see new Rey making them good in arena, but without reworks, I don't think Resistence would be any good in arena.
Their only trick is the expose train. It's not like the Rebels where they're all so OP on offense you can just plug any in.
So I could definitely see some minor reworks to make them more accommodating to a new Rey leadership in arena.
Or maybe Rey will be similar to Thrawn and GK where you just plug them in with the current meta and she's amazing. No way to know before they release her kit.