I only see 1 CLS team in my shard and I have a feeling he does it more for roleplaying purposes than anything
Most of the people I know who have G12 JTR changed to Nightmare/Palpa as well, JTR is not good on defense, not compared to nightmare any way.
I think someone said Rex earlier, Rex is just a response to Palpa, so if Empire/Sith didn’t exist neither would Rex.
In terms of comparing Treya to GK, my problem is not with Treya, my problem is with the whole team, I haven’t even seen a Treya yet, the only difference Treya will make is replace Vader in that team, it’s not Treya’s fault/issue, I think you’re right in terms that she won’t be as prominent as GK because you can’t just fit her into any team like you can GK