Wondering Where to Throw Next Zeta

Hey there, I'm in a relatively old shard (April/May 2016) and am about to land my fourth zeta. It's taken me this long because I had taken a break for a while + took me a while to get my DS ships. Anyway, I currently run a very fun to play Thrawn team consisting of a double zeta Thrawn, ShT, Storm, Death, and DN. I'm wondering if I should place my next zeta on DN's unique or put it somewhere else? My plan is to replace DN with DK once I get him to 6* (he's almost 5* and I do 1 refresh a day). Maybe those two aren't the best option, maybe you guys have some better recommendations. Would you mind checking my roster and telling me what the best use for my next zeta would be?
https://swgoh.gg/u/fizzik/