Josh Koscheck wrestled at the same weight class as Colby in college, & he was NCAA Div 1 champion, runner up, 3rd place, & 4th place nationally in 4 yrs of college. His accomplishments dwarf Colby in collegiate wrestling. Yes, Colby strikes with more volume & has more diverse striking (Kos is kind of predictable) but sometimes styles make fights, & a bad style matchup for Colby is someone who can outwrestle him. GSP's era had a lot of good wrestlers, & styles make fights, even though I think Colby has good striking (for a guy from a wrestling background)
Not saying Colby couldn't be champ but its not a slam dunk by any means