Some more feedback after a week of tests. I run CLS R2 OB Leia and GAT.
Im only 120-170 in arena and never refresh so take that in mind but Im on a 2016 shard and my guys are undergear. G12 CLS R2 G8!, Everyone else is g9. 95% of teams in my rank are all g11 and g12. My only zeta is CLS IBAT.
My speeds are 220 Thrawn 215 R2 Then CLS at 205 and OB and Leia around 175. Im faster than about 80% of the teams with GAT. I avoid Raid Han. Dont see NS or JTR at my level.
I used to frracture first. But since I started swapping TM with OB for Mind Tricks I have improved my rank by about 50 spots. Mind Trick really screws their TM and Ability blocks OR it gives all of your guys TM, or both. Then R2 smoke on OB. Then fracture or CLS. Then everyone else. OB gets MT and Taunt off faster, but even if you dont get the Taunt off their order and TM are screwed and I usually win against way better teams. If I put the taunt zeta on OB I think I could break top 100 easy. Im falling about 50 spots per day.
Also if you havent tried Leia she is a great damage dealer and so easy to get.
Just my personal experience.