It's a trick question, cause athlete doesnt make them great at their sport.
Plenty of great track stars couldnt play football to save their life but they made the team sometimes for their speed alone.
so do you mean best player in multiple sports or best athlete?
But Randy Moss was a great athlete and football player who also excelled at hoops.
Elway, drafted by the Yankees originally.
Antonio Gates. Was originally a great hoops star who converted to football. He actually played on a good college hoops team with Kent State. Might be one of the greatest tight ends to ever play, and didnt play till later.