yeah I was going to see if I could unlock r2 if I bought the bundle, but don't think I'll be able to get 2 more 5* toons. Shame the bundle isn't better
Just keep working on the characters and you'll be in good shape for next time. Same thing happened with me with BB8 - had a bunch of FO at 4*, but just not enough time to 5* the lot.
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You need 2 more toons at 5*, if you like to spend money, you may unlock the at 5* R2D2. Better gear them to g8-g9 and mod them.