Great, let's change formation, tactics, hindering the clubs balance or whatever they are trying to do these last few weeks just to try to fit Rashford to help him improve and be that main man for the club and England (where we know is impossible because guess-what he has Kain as the striker).
Why don't all the pundits tell Rashford to change his country to some other that can make him their only main striker rather than stay with England and hindering all his generational talents playing subs to Kain.
The player is 20 yrs old. We really can't provide every players all the playing times they desire then there would be no squad players as we know it. Lukaku is here to stay, he's ready to step into his peak in a year or two. Rashford is like most of the young players that are young, they become squad players in big club. They'll be that when they have chances to prove that they can make the step up and be that main man. To become that main man in a big club like United, really does need more that talents. You have to have perfect timing, confidences from the manager, players, fans, and the sheer confidence in yourself not to crumble upon pressure to score and win every game. He's not there yet as proving last season.
Just support the club as a whole rather than individual players.