literally just discussed this with my mate
Not having Zlatan means Utd have to be more creative and less direct. It's brought the best out of some players. Utd without Zlatan prevents the temptation to go route one or more direct and use Zlatan's physical and dominating presence. Instead, they have to play differently and be more intelligent with the ball - using Rashford to his strengths can and will definitely pay off in the long term.
I don't think Zlatan will come back after his injury as good as he has been this year. Love the player though. Fantastic talent.