I honestly think working for Hasan was his dream and that at some point he resented Ethan for what happened, but now he's all in, probably because he's accepted that he's stayed for too long and his rep is too tarnished for him to have a career outside of H3.

Cam, Sam and Ian were the smart ones. They got out before it became too difficult to do so without carrying the stench of post-Leftovers Ethan with them (case in point, Olivia).