Just off the top of my head I can already remember three assists where he went outside and did a cutback in big games: west ham fa cup semi replay to fellaini i think, everton fa cup final (he also should have had about two more in the league game vs everton running around that poor fulback time after time), another fa cup game against numpties.
He could run inside and outside last season and has just lost form. He can be the future on the wing too, just having second season sundrome which is not abnormal for young players, no matter how talented.
Rashford is a limited footballer who we should hope shows he is not as one dimensional as a striker in the long term. Have always said his skill level seems limited but he makes good use of the few assets he excelled at in half a season. Let's see more. Jury is out.