He is / should be a creator in midfield but I think he's playing too high up and we can't carry both him and Mac in the same XI. You only need one playmaker.
Basically the way I see it:
Grav - strong defensively, can play but generally shouldn't because he's there to hold
Mac - strong creatively, can defend a bit but he's there to create (basically Grav in reverse)
Szob - workhorse who can play a bit, decent from set-pieces, strong in the press
Flo - probably stronger than Mac creatively and can carry the ball better, but weaker defensively.
Four players for three places. The problem is we've been playing all four of them. It should be Grav + 2, Endo for Grav. Which two would depend on the opponent. The third can come on with Jones when the others get tired.