Mbappe is of course exceptionally good. Real Madrid have a great striker in the person of Benzema. Maybe it even performs better than Mbappe. How would you actually get those 2 to play together? I think Benzema performs so well because he has a free role, when Ronaldo was there it wasn't. If Mbappe had gone to Real Madrid, it would presumably be at the expense of Benzema. 1 top striker is enough, and you don't want to put 1 of the 2 on the reserve bench.