You do not, you base it on the player's impact in the game.
Enzo obviously impacts the attacking game and the couple of times I saw him play midfield was OK
Cates impacts the defensive game a lot more and can play any position on the field.
So If you were picking a team and both these players were available you would pick both one to play offense, one to play defense. If you could only pick one then it would depend on the rest of your team.
I pick Cates first to shore up the defensive unit and win balls. Enzo's skill would mean nothing if you cannot get him the ball.
