Thread:Shadowfyrelord/@comment-26210095-20160815212207/@comment-25901581-20160823232058

Well, he hates Sauron and Morgoth, and would refuse to serve whoever this new evil is. He leads the remaining orcs after the defeat of Sauron, and intends to have them prosper.

If the king wanted a reason to get him to cooperate, it would be that they'd leave the orcs alone. Gazash is a brilliant fighter and very difficult to kill, he'd be perfect for the expedition.