Well ironically the NFL is just about the only other sports league where this has happened.
Check out Ezekiel Ansah for example, he was a basketball player and could not make it on the BYU college team so he switched to football around the second half of his sophomore year in college, having never even played in high school or at any level.
He went on the become an NFL pro-bowler in just a few years from that point. According to Sherdog logic that must mean that BYU basketball benchwarmers > the best NFL players in terms of A-level athleticism, and also that the NFL has lower level athletes than just about any other sport.