Well yeah.
Well yeah? He's not a right back.
Steve Howey wasn't a defender but that's where Keegan played him. IMO Santon is wasted at left back because he won't get behind the defence and cuts inside every time, which makes the defenders job easy, and the crosses mostly useless. Compare that with Debuchy or Raylor's delivery when they play as full back. Santon has played RB before in Italy and could easily do it again if he was given a run at it IMO. A full back is a full back, if anything, being on his natural side should bring out much more in his game.
He cut inside to his weaker foot every time when being played on the right.
Moving him to right wouldn't fix anything. He's a LB who had a tough ending to the season, hope he does better next season.