Director Krennic and Death Trooper viable without zetas?

I run zKrennic(l), zDT, zVeers, ShoreT, Rex, I can usually finish in top 5 and am cable of beating most teams outside of triple cleanse. Once I finish gearing my 6* Thrawn I'll swap out rex for him and should be able to consistently beat the triple cleanse teams. In his current state he does very well in GW with no zetas to help me with my trouble teams (zaul/triplecleanse).

So they're definitely viable, but if you're going to do it you should definitely zeta DT, his TM gain when krennic gets hit is huge.