For me, I can't really predict Rashford trajectory or how he will eventually perform at his peak. He has some really strong elements to his game, but also has a lot of really weak elements that might stop him from being what we hope for him to be. He's a weird one, he has a lot of skills, but his touches aren't there yet. He can deliver a pass, but I won't call him creative. He can shoot, but I won't say he's a good finisher. He can absolutely destroy a player one on one, but I won't call him a good dribbler. There are a lot of elements there, but he can't yet seem to put it all together enough to make him the consistent threat throughout a game that I think he can be.
Martial is very different, but is wrongly put together with Rashford. Martial has very identifiable skills that makes it easy to see some of his talent. However I believe these skills ( dribbling cutting inside and side finish) are so flashy that people tend to not notice how limited he actually is in his attacking play. He can't attack the space when dribbling from the right hand side, which is why he can't play on the right wing. He hardly takes any other variation of shot other than the right foot side finish, he's not great with his left foot and even struggles with touches when tasked to use it which usually force him to shift his entire body to got to his right foot, he's not a good passer of the ball and doesn't make or doesn't have the capacity to make good off ball runs. Most importantly, he doesn't provide enough of a threat inside the box as he doesn't make the right attacking movements. His dribbling and agility makes it easy to think he has the capacity to eventually do all of these things, but what if he doesn't?