Is DK Viable at 5*?

Krennic is very weak! I have him at 5* and g11, gave a zeta to DT for more survivability, but he still doesn't hit hard and dies fast. That's the kind of toon that must be 7* to be viable at arena o CLS will put him down with one strike.

Unfortunately his shards/crystals is among the highest price, even after 7 months CG stil hate empire.

But if he was a rebel things sure would be way diferent...