Because of the point that everyone has said: Why not just ignore Dembele, and get 2 defensively solid players who offer more. For example: Moutinho and Strootman, or Fellaini and Strootman, or any cominbation of those 2 players. Because while they are all unfinished, they all naturally understand the role, and can become great players in it.
I won't be against it. I was saying Dembele as he was available and looked like realistic target. Given the choice I would say we should sign Fellaini and Moutinho but I'm not sure we can sign both. I was just going with realistic targets.