He might not be a defensive midfielder, but he is a top level professional football player who does play in midfield who did move into the 6 when Rodri pushed further forward last season. Between him and the coaching staff they need to be working together to make sure he’s far more disciplined defensively, even if it’s not his natural position. If he does go rogue, running out of position to win the ball back and being bypassed, someone else needs to fill in where he’s left a hole.
This is fairly basic team play, it’s not like it’s complex progressive patterns of play with the ball.
A 19 year old played left back a few days ago… he did well and he’d never played there before in his life.