Size + Experience up against NBA level defense and offense.
If Cleveland took on the best college team(or even their all stars), they’d still win most of the time because they field a mostly seasoned NBA level team.
Give the college team 80 games against NBA level teams first, and perhaps they’d have a shot. But then, they’d not be a college team anymore, really. They’d be a bunch of talented guys who have played NBA teams for a long time.
Speaking of those lousy Cavs, they just got their first double digit win of the year against the Heat. Chris Bosh had his most dogshit game of the season.
Kind of a different thing but for about 45 years the NFL champion would play a team a college all stars that had just graduated. Overall the NFL went 31-9-2. The college players did well in the beginning but as the NFL got better, they won more games. The college players didn’t win a game the last 14 times it was played, which fortunately it isn’t anymore.
Had to say what was a worst concept for the NFL: The Chicago Charity All Star game or that stupid “Playoff Bowl” they had in the NFL in the sixties with the 3rd and 4th best teams playing each other when the season was over.
My best guess if both NBA teams try hard, the pros win at least 90% of the time. Virtually everyone on a pro roster was a start in college plus they are older and more developed.