Who must be the last? Not for pvp, just focused on dark TB and events like Chewbacca and monthly events like Rebel round up. And maybe backup party for sith raid.
If your going to use in the STR, Zam does very well with this team in phase 2. Her 3rd ability gives everyone back a bunch of health and protection through the leadership zeta on Bossk, and she recovers additional protection for each of the 3 side guys who have a TD on them. Its like having a healer on the team who also takes extra turns every time she detonates a TD, which also can happen on assists.
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Cad Bane is underrated imo.
My Cad hit almost the same score as Greedo in sith raid T6. He has consistency.