Wow you really think Koscheck is the best wrestler? I'm not flaming or anything, but seriously. If the dude was so good, why isn't he in Diego's shoes? Even Kenny Florian, who didn't win, has more fights and exposure.
I have yet to see Koscheck do anything impressive, even if he is a good wrestler. It's the full package. Look at Royce Gracie vs. Matt Hughes, #1 BJJ guy against a full package fighter. Even Hughes would rip Koscheck apart in just a wrestling match.