Which games did Rashford not play in which Lukaku did? I cannot remember any. Rashford also got injured at one point but I’m not sure if he missed games or played through the injury. Even at the Nou Camp it was Rom that was benched. I think it’s obvious Ole has Rashford as first choice.
Rashford can play as winger too. he is versatile to play in 3 positions, so obviously he plays most games.
Lukaku started against Fulham, Rashford was unused sub
Lukaku started against Wolves, Rashford wasn't in the squad.
Lukaku started against Crystal Palace, Rashford came on as a sub
Lukaku started against West Ham, Rashford came on as a sub
Lukaku started against Arsenal in FA cup, Rashford came on as a sub.
Lukaku started against Reading in FA cup, Rashford came on as a sub.