It also came after decades of helping subjugate this same galaxy... decades of violence, torture, persecution...
Despite his help he'd have to face punishment had he survived and i don't think many would hail him as saviour(other than Luke).
That scene where even his henchman had to avoid telling him how pathetic he is... was just a terminal shot to his (already low) credibility.
Maybe his dad will take the lead...
You suspect
Zane right?
Personally i would go the Iris route.
She would take great pleasure doing that to both Ethan and Zach, i think