I'm running Empire but yesterday faced another full gr 12 on my last GW node. My usual zVeers, troopers and Thrawn couldn't get rid of them and I only could remove some protection of my opponent's team.
CLS(L), R2, DN, Thrawn, GK.
After several tries, I switched to a GK lead (gr 9) with Ezra, DN, Thrawn and ShT. This team could finish my GW without a loss. Retribution with Thrawn and Ezra is great and Ezra's kit works fine in that team. Ezra gets more health and defense from GK's lead and hit like a truck. ShT works fine with GK, ensuring DN to do his job quietly.
Just my 2 cents ...