Galactic Legends Lord Vader Requirements: Group 3

I'd be shocked if an Ahsoka and Rex weren't included in the requirements. I'm guessing both at R7, but the third one is a toughy. Asajj, Nute, Poggle, Bariss? Could be any one of them, but I'd hope at R3 or R5.

For some reason it seems that the devs have forgotten that there are more numbers between 1 and 8 than 5, 7, and 8. Maybe the keyboard numbers on their one computer are broken?