Rate this guy, and it will all come down to whether Pogba stays is my feeling. Great engine and physically very strong. Can sit deep and dictate play and can also play a little further up the pitch. Sometimes you have to take players comments with a pinch of salt but he was recently quoted as saying he is relaxed around the new contract but winning titles is important to his career. So seems to have the right mentallity.
I think with our Current set up Ole, truly doesn't trust Fred to be the single pivot in midfield. He is not disciplined enough for the roll, nor he can physically dominate in the same way as say a Rice or Ndidi can do. So he is forced to play McTominay deep or Matic. Sabitzer is good enough to be a single deep midfielder from what I have seen of him.