He does get bit parts that's why he's pissed off, watched UTD's pre season last year against Real/Barca, against Real they played Rashford, Lingaurd, Marshial, they were superb the best iv'e seen UTD for ages before and they haven't matched it since, Mourihnio has set Rashford back for me the lad was flying, why he plays Lukaku for the full 90 all the time even when he's not firing points to something between the 2 not being right.
He plays Lukaku because he's a more complete striker. Rashford is not better than Lukaku at this moment in time.
Rashford was flying, but there have been plenty of players who've made a big initial splash but not kick on. I agree Mourinho hasn't helped him though.
However, I still wouldn't bet the house on Rashford as the main man ala Lukaku and Kane...which is what a lot of top clubs would ask of him in that position. He has more to prove on that score, and that's probably why he should get a transfer to a side he will be playing every week in his desired position.