In what way though? while his off-pitch activity is very commendable, football perspective-wise he hasn't done much than Theo Walcott. Both relly heavily on pace and extra space given to them to exploit. Walcott was a very decent goalscorer too, and unlike Rashford he wasnt really set up to be a goalscorer as he'd to accomodate genuine strikers in his team, like RvP. For me there hasnt really distinctive differential between these 2 yet, hence why I think Rashford need to up his game, like his decision making, passing and receiving the ball in the tight area, and why should not he? cause unlike walcott Rashford still has a time to do exactly that.
On second bolded part I think it's combination of injury and fatigue. Hed had long term injury in 19/20 in which he was supposed to be out for the rest of season then pandemic arrived and football got prolonged schedule up to August. Last season was marathon for players, they had to play every 2-3 days which made his condition even worse. This is why i think hes made very unwisely decision to go to EURO, and
world
cup in 2022 that would be 3 summers without proper rest for Rashford.