What Rebel Zetas first?

IBAT, and Han's for sure,
after that, it kinda depends on what you need to counter-
Fracture giving you problems? Old Ben
Debuffs? R2 (the cleansing one)
If neither of those are a bother, then go ahead and grab the r2 stat booster

Now I can't speak for Chewie's zetas...
As far as I know, CLS's other two zetas are kinda meh. Chewie bringing tenacity down makes his lead slightly more irrelevant. While they might be able to turn a tide or two, your zetas probably better spent elsewhere

I’ve got Devoted Protector already
So IBAT, then Han I think then

IBAT first, definitely, and Han's Shoots first is a definite also. Then give R2 both of his. You probably won't ever need the other two on CLS (I still haven't done those, and ran him in Arena for a very long time). You won't need Old Ben's other one either. You'll want to do both of Chewie's as well. One is a little better for PvP, while the other is a little better for PvE, but you'll want them both, eventually. Might even want to prioritize one of them over R2's Combat Analysis.


@Shadowscream

It Binds All Things / Shoots First / Number Crunch / Combat Analysis

+ Chewbacca’s unique is very strong I guess.