What he does have is the ability to be solid, he can tackle, head the ball and knows where to position himself. Huge heart and desire as well. There are better left backs out there but if you were writing positions to improve his wouldn’t be anywhere near the top for me.
And if the right back is an attacking type player, then a defensively minded (I don't think he is particularly though) one on the other side isn't a problem, a la Gorgeous George/Joe Skarz.