Thompson>Wach/Charr/Mormeck until proven otherwise. Thompson crapped out with Volo, obviously, but since he's been beating up better opponents to Wach, and I think displaying much better skills, just since his last fight with Volo alone, I would doubt Wach stops him. He may have the power, maybe not. But landing the power dead-on enough to stop him? Meh. I wouldn't bet on him to win, let alone by stoppage. Unless he goes on to show more than I think he will, that's my opinion.
Wach will put on a much better outing than Thompson... And I think a major reason why is because Wach is unproven in a top fight like this so far... Wlad may underestimate him. But then again, Wlad is always fully prepared and adapts extremely well to whatever.