JTR, BB8, R2D2, GK and...?

Old Ben.

Yes he is. Best is as it seems Old Ben. You could try Probe Droid if you have acces to it.

OG Rey is quite good, Thrawn is good on offense, not sure about his defensive capabilities though. Old Ben is good too.

Podcast I listed to called this setup with GK and Old Ben the "My Two Bens" team.

zThrawn seems to hold the best on defense for me. My Old Ben is G12 and just waiting to zeta his taunt, which is supposed to be very good on defense. There is a guy who runs Chopper on my shard and is a pretty tough team, too.

I am using either CLS or Thrawn. Most in my arena have settled on two Reys.

Chopper.....faster bb-8 and he also will help with the scoring crits and getting illuminated destiny off

Raid Han has been working the best for me

Scav Rey has worked out the best for me. I have tried zBen, zHan, Thrawn, and Chopper in that spot and Rey is better than all of them. I rarely drop out of the top 15 anymore.

I've tried scav, chopper, Thrawn, and Zolo. Zolo is fantastic on offense, and my go to for getting through NS, but not exceptional on defense. Thrawn is solid both ways. My G11 scav is too squishy to be effective. Chopper has been my strongest performer.