If you compare the expected goals of Rashford, Greenwood and Martial to the actual goals scored this season, or over their careers, then it is obvious who needs more chances on average to score goals. While Greenwood has a small sample size, and it is unlikely that he will continue this extreme level of efficiency, his finishing abilities makes it likely that he will continue to be much more efficient than Rashford. Martial is more efficient than Rashford.
And with PP, Bruno and maybe Sancho, we will have 3 excellent creators.
If I only used the games since the restart, I would say that Rashford had improved his ability to pick a pass in the final third, based on the two assists against Sheffield. A much needed improvement, as he has been somewhat predictable when receiving the ball in the final third at times.