As for the last episode being any bit predictable, I think the last 5 minutes were the only part the writers cared about. From the very start, Young was like "I'm being framed, so I'm gonna play this cool til we find out who did it". He was going along with everything, so there were no big surprises. It had to be Rush or Wray, because those two are the only ones who hated him in charge. I don't think Young was planning to leave Rush on the planet, but the defiance even to the very end probably said "this guy is unredeemable".