Looking at it, I'd actually picked up one of the OS KO Dinobot hands. It's just propped up under Zarak, so nothing clever really! I agree that, were he sized to scale better with TR Leader Prime, I'd be thrice as happy to have him in my collection. I'd quite forgotten that his face was that colour in the comics. There looks to be no real danger of paint rubbing, so you should be fine. I probably won't bother myself as again, size-wise, he's too big to be that iteration of the character for me, but I look forward to seeing how it turns out!