Maybe it's just me but I think even though we play with 3 forwards, in reality, it's essentially Martial and Rashford playing up top and James is supposed to hug the line more. Like he is being asked to be a combination of Giggs / Beckam (some of the crosses to open up play for goals were quite interesting, but otherwise, he would drive forward, with or without the ball).
I personally like that idea. Maybe when Pogba comes back, he's coming back as a 10, with Fred and Scott now stabilizing a bit more the middle?