Morata has fired a team to the Champions league final at 21 years old scoring vs City, Dortmund, Madrid (twice) and Barcelona in the final. His numbers since his Madrid days have been exceptional. Over 1 expected goal/assists per 90 this season. He's a million miles further ahead than Rashford.
I genuinely fear for Rashford. His development is being stalled on the left wing. He's now playing as a 1v1 player out wide that's solely dependant on his pace, much like Kingsley Coman. This is bad. Rashford needs minutes up top.
Lastly, Dybala is an impossible signing. Don't even discuss it. Almost as rediculous as the suggestion of Neymar. Unlike Pogba, Dybala isn't expendable. Besides, I don't see a reason for him leaving Juve.
United can't afford to go longer without Champions league football. Given the quality of players, United should be challenging for the title. Problems are all relative to coaching. United have been pitiful vs deep blocks.