Char minimum for thrawn?

Minimum 8. All uniques maxed.

With zeta?

Zetas NOT required, g8 min, good mods, omega uniques and a little patience will take care of it

Ok :) so if i take ezra to g9 and leave the others g8 it should be enough right? What about mods tho?

I'd also like to know if Sabrina or Chopper is better for this event. From other threads seems to be Chopper due to the health regen/survivability, but a good case for Sabrina with the shred and extra DPS. I'm getting both ready anyway

Chopper, because you want your chars to survive. 1) they gain really much health and protection
2) he has a taunt
Dead chars dont do damage with sabine ;)

Did u use chopper or sabine?

I ran Sabine, mods wise put as much speed and damage on Ezra, Sabine and Hera as possible and protection & health on Kanan and Zeb at the expense of speed - I tried 100 times with all speed maxed and won on my first time after the swap around.
All G8 lv85.

Ok :)

Make no mistake: If you take Ezra to G9 and leave the rest at G8, you're going to get a tough fight. I know many people say that they did it with G8 only. Some had to try more than 200 times before RNG was in their favour.

So, to answer your question about if G8 is enough, I'll ask you this:
Will you regret it, if you leave your Phoenix at G8 and then fail to complete the event next time?

If yes, then perhaps you should aim for G9/G10 instead.
If no, by all means sit back and fingers crossed.

BTW - do not underestimate the importance of good mods. You will need it.
So make sure to allocated time and ressources to farm a little mods.