Wilie Wood the Hall of Famer DB was a QB
Herb Adderley the Hall of Fame DB a college RB
Mel Renfro the Hall of Fame DB a college RB
Clem Daneils the first Raider to have a 1000 yard season a converted DB
JD Smith the first HBCUer to have a 1000 yards in the NFL a converted DB
Bob Hayes was a RB at Florida A&M, WR in the NFL
Bobby Moore/Ahmad Rashad a RB at Oregon, WR in the NFL
Bobby Mitchell a stud RB with the Browns became a Hall of Fame WR with the Commanders
Charley Taylor a stud RB at ASU, became a Hall of Fame WR with the Commanders
Lance Alworth was a running back, Hall of Fame WR
Paul Warfield a running back, Hall of Fame WR
No reason not to try athletes at other positions,
Ryan Tannehill was a WR.