Firstly, he is a big unit and a runner can't go past him as easily as they can past Arteta or Wilshere. A midfield that is not capable of stopping runners is one of our primary defensive problem.
As for passing goes, he is fairly comfortable with it without being spectacular. I'm sure, he can learn to play a simple passing game and won't be a liability. Otherwise, he can contribute higher up the pitch as well, would be a constant threat from set-pieces and an asset whilst defending them and would be a good man to kick ball in the fag end of matches that we're chasing.
Ultimately, he is a very successful Premier League player and whoever gets him will have an asset at hand. He will almost invariably prefer going to Moyes' new team if they want him badly, so, the best course of action for someone who wants him will be to snap him up early.
