So my current team for Arena is:
5* Phasma (L) - Gear 6
5* JC - Gear 7 (11 from 6*)
5* Lumi - Gear 6
4* DM - Gear 6
4* Kylo - Gear 6
All are level 45, total of 13,587 power. This team does pretty well, I'm working on gearing them us as fast as possible but I just unlocked Vader yesterday, haven't really invested anything into him, and I'll be unlocking Sidious tomorrow after Arena rewards are passed out as I'm only 5 Shards from unlocking him, so my question is if I should just continue with my current team or should I look to add in Vader and Sid into my line-up once I'm able to gear them to similar power levels.
To add to that I also have 4* Luke, 4* Leia, 5* Cad Bane, 5* Old Ben, and 5* QGJ as some stronger contenders for a spot in my team as well. I have a lot of other heroes but these are some of the more notably starred that I have to consider as options for my team.