Two big head-scratchers for me, at least how they turned out at OU, were Ryan Humphrey and Leonard Flowers. Both signed with OU. Hump at least put in two good years before leaving mysteriously (at least as far as I was concerned).
Flowers, who was the clear-cut POY despite the presence of Stacey King down the interstate, was apparently a total head case who had a weird history. As far as I know, he never played a second at a four-year school, leaving OU and Southwestern Louisiana, and also flaking out at Redlands JC. I even think he tried a comeback around the age of 29, and people in El Reno still had a grudge about a perceived slight by OU and Billy Tubbs back in the day.