Getty University of Central Florida quarterback John Rhys Plumlee. The Tampa Bay Buccaneers need flexibility when it comes to the quarterback position. Baker Mayfield is entrenched as the starter but after him, it’s much more fluid. One recent look at a draft-eligible quarterback might be the very definition of flexibility with UCF’s John Rhys Plumlee, who also starred in baseball for the Knights. According to Fox Sports’ Greg Auman, Plumlee was on hand for the Buccaneers’ local pro day on April 11. Plumlee, 6-foot and 200 pounds, is undersized for an NFL quarterback but he’s tested through the roof headed…