Everybody can get knocked out when you hit them perfectly on the temple, that's just the way we're designed. Plus Koscheck isn't exactly a great "eater". Dude has no "chin". Thiago is not a puncher, he can't floor anybody unless he hits you perfectly on the jaw/temple. And like I said, almost any UFC fighter can generate enough power to rock you if they hit you as hard as they can on your chin. Hendricks, Hunt, Nelson, those are natural punchers. They hit you in the face, you get knocked out or you get floored. I saw Thiago fight that one asian dude a while ago, he hit him with 20 straight hooks and whatnot, the guy didn't even flinch, it didn't bother him one bit. He can't knock anybody out with one punch.
Hope his cardio has improved. In the past you basically just had to survive the first round, maybe the first two rounds and he'd sort of gas. Jon Fitch pretty much laid the blueprint out there for everybody to see.