Old Ben grants evasion and TM on evade to everybody, which can be very frustrating to play against. Also, when you start the match you can use Old Ben's ability block following by SThan taunting, which can make things harder. Lumi only grants half the evasion to non-Jedi allies and her passive heal at the start of each turn isn't as good as 30% TM on evade.
Phasma could also be a decent choice as a leader for the assist attacks.
Replies
Old Ben (l), Rey, qgj, st han then leia or royal guard.
That's about old meta standard since you don't have aoe meta champs like lando, Anakin, Palpatine, wedge, or biggs
And why old ben and not phasma or lumi
Phasma could also be a decent choice as a leader for the assist attacks.