Hmm... I don't know. At Real, what made Di Maria so effective as that 3rd midfielder was his ability to push the ball forward at pace. It was vital to their counter attacking system. Kroos doesn't have the capabilities to do that. Sure, he'll add a threat if Real are attempting a more possession based system but that Real Madrid front four of Bale, Ronaldo, Benzema and Di Maria was truly outstanding, a joy to watch on the break.