I’ve never seen an Ewok in the arena. It’s been a really long time since I’ve seen an Empire team. Nightsisters came and went. Right now, it’s all the same meta combinations in the arena. I don’t mind.
That’s what the arena is all about. There are other sections of the game where I mix it up and play around with different teams and have fun. The arena is a source of crystals, where I play the most effective team during payout hour once a day, and if it’s the same team as everyone else—who cares? I just want to maintain my rank. If using a unique team makes me a target, then I’ll use my unique team in one of several other parts of the game, and stick to a carbon copy cookie cutter in the arena. I’m fine with that. There are other game modes that let me be creative.
Right now, I’m using Jedi Training Rey, R2, BB-8, GK, and CLS. I’ve tried others in that final spot, which is the only real variety at the moment.