I have fortunately last season there was one game I watched him play in that role. Even this season he has played as CM once.
I never say Donny just works well in advanced areas. I said Donny can adapt or play on the right to play like Muller. Don't make lazy assumption/guess on why I said Donny is like Muller.
It means Muller has the same assets as Donny. Both have the same technique on the ball, very good to handle pressure, composed on the ball, great off ball movement, have ability to find space and create space, likes to play quick & one touch passing & their intelligent gives them flexibility to play in lot of different position midfield or attacking mid. Both are not physically strong & rapid.