Kanan 'The Mountain' Jarrus

I patiently collected all the shards for Jedi Master Windu event.  I took care of the mods. First tier first try, not even close to lose. Second tier had to do few attempts but wasn't very hard. Third tier...oh boi. Is it normal that Kanan hit for 160k without crit and 260k with crit? My R7 TG has literally no chance to get past 1 Kanan stack. I don't have his zeta(lack of materials) but before event ends i will unlock it. Is it some kind of bug? Or this zeta Is mandatory to even try?

EDIT: I tried 3rd tier like 30 times.  Did it without zeta, sheesh. I guess you put 3 x def set, protection everywhere and speed at least +69(that's mine) and then you spam 2nd special + basic and when you have crit avoidance up plus at least 50% protection you use 1st special. Then repeat till the end. Funny thing is this tier wasn't actually annoying, i enjoyed it(i have a lot of patience). Good luck to whoever is still trying :p