Sully has nailed it. It's really rather simple; fix those positions and we suddenly become a much more potent unit.A RW so we never have to see Rashford play there again.
A CM so McFred is no longer our first choice midfield partnership.
A CB so neither Lindelof nor Bailly are starters and are unlikely to play with each other in a serious game.
Gimme those three signings this summer and I'm happy. It ain't a lot but it would make a massive difference.