A loan would do him good - Evans, Cleverley and Welbeck all had decent loan spells before being reintegrated into the first team, while Smalling and Jones had previous experience at Fulham and Blackburn.
The immaturity in Rashford’s game has been showcased this season, and needs to be ironed out in a less pressurised environment; it’ll benefit both the player and United more in the long-term. Everybody seems very sensitive about this, but a temporary move away is logical.
Incentivise a Mahrez move for Leicester by giving them Rashford next season; they’re one of the few 4-4-2 teams left in England, so Rashford would get plenty of games as a centre forward and come back a man.