The discussion will certainly be very heated about this. We can't predict what might happen in the short term. i hope this doesn't create disagreements within the team that could lead to bad things. Arguments, divisions, and envy?we know very well what happens.
He doesn't really feel the "need" to fight for a spot to be fair, why would he? He is "technically" a bench player, that is true, but lets take a look at the situation they have. Lewandowski is 35+ years old, he is getting to what 36?37? So when he is tired, who will replace him? Rashford. When Raphinha is tired in a game, and needs to be subbed out? Who will play instead? Rashford.
When Yamal is booked, injured, tired, who will play instead? Rashford. Whenever any of these players, needs a rest, booked, injured, subbed out, who will get in instead? Rashford. Believe me, he will get as many minutes as one of them, you know why? Because while they will be playing for one position, this dude will play for all three of them, and will get minutes from not just one player, but from three players.