Cork is a genuine holding midfielder, Norwood is really poor off the ball.
Norwood is tremendous with the ball, however in Neil, Rigg and Ekwah I believe we have players who can replicate his on ball contributions, even if they aren't as good, but I don't think we have anyone who can remotely come close to Corks defensive attributes.
For me, a Norwood/Neil midfield would cause us problems. Of course this is just my viewpoint and I agree i'd rather be signing a player who's played a lot more regularly than Cork.