What was Minteh doing?

All first half v arsenal, I was waiting for Minteh to come on. He is great at dribbling unlike Gomez. So when Mitoma goes off first half, I assume Gomez moves to the left and Minteh moves to the right. This makes sense because Gomez has played on the left before and is also right footed. This means we have two inverted wingers who can cut in and hurt them. However, Minteh is on the left side. This makes sense when we're chasing a game in the last 15, but he is much better on the right. Putting him on the left has only worked once, v Chelsea, and that was when we actually had a striker playing to head the ball in from Minteh's crosses. Minteh moves to the right for one or 2 plays, puts in some very good balls, and then moves back to the left for the rest of the game without much of a meaningful impact. It doesn't make sense.