Can Witsel be creative?
From what I've learned (havent seen him play properly), he looks like a poor man's Khedira. I mean, what he could offer is already fully provided by the German. Not exactly creative, but intelligent movement off the ball.
Even considering Marchisio immediatly closes the gap we have at DM, I think we still need a creative/technical midfielder from the bench, with similar characteristics to Pjanic. Like that Dahoud guy or stg like that.
I'd like to see Cuadrado playing as a box-to-box RCM. I think he would be very good at it, and a good replacement for Khedira when he cant play. So Witsel would be unnecessary.