Your take on his productivity, the comparison with other players, is being on the opposite end of the scale. The problem isn’t his overall numbers and how he used to perform, but the direction he’s heading in and what it means. Average performances but producing goals/assists has gradually shifted to average performances producing fewer goals/assists and awful performances with barely any productivity. His numbers indicates very little, if he continues with the same form as he’s shown so far in 2021, he’ll simply follow the same path as Alli and Martial, to which point it’s quite fair to debate how good either player really was. It’s hardly uncommon that young talents, and there’s an abundance of those, no matter how good they initially look, fail when it comes to continuing their development.
Maybe Rashford will never get back to the form he first showed, maybe that was his short spell, like so many others before him.
Maybe Rashford will thrive under Ralf, he’ll get the guidance he needs, maybe it’s just the injuries that have been holding him back and once everything clicks he’ll start looking like the player everyone expected him to turn into.