When Norwood doesn't play, we look tragically worse (Millwall at home a particularly good case in point) because no other CM at the club has any desire to show for or can move the ball forward like ON does.
Berge is a poor midfielder, Hourihane not much better and we've run a failed experiment with Osborn playing central - none of them are worthy of being a replacement or foil for Ollie.
If we are to see the best of ON again we are crying out for athletic, box-to-box midfield general alongside him who isn't scared of wanting the ball. Maybe it's Coulibaly long term, but if we can get Fleck fit & healthy again I think them two behind Ndiaye would be the best we can hope for short term.