If you are going with g8, it's going to take some luck. I have a g10 ezra and sabine 9 with everyone else 8. I have really good (not the best) mods (5* L15) and no speed over 190. On the final battle, one of the dt's hit ezra 2x but didn't daze, so ezra hit back 4x and killed him (that was very lucky). Also, most of their fire was not aimed at one toon, so they all could regain their protection each turn.
Also, if you are using chopper it's easier (b.c of his unique) so you don't need as much gear requirements, but if you go the sabine route, you had better bring the damage.
Good luck