People talk about Saha not doing this and I agree with alot of it but what about Cahill? He's playing behind the striker, a massive part of his game should be linking up with midfield yet he rarely does it. You'll occasionally see him lay the ball off and run towards the box, looking to get on the end of things. He's never interested in any type of link up play. I saw a chart in the Guardian about where the players spent most of there time against Sunderland, and Cahill spent the majority of the game further forward than Saha.
He's playing a very limited role and he isn't anywhere near as much of a goal threat as the likes of Saha or Yakubu. We play him there so he'll drop in and make it a five every now and again and hope, going forward, that'll he'll nick the odd goal.
We should be looking to play a far better football behind the main striker, someone with the ability to link things up aswell as get the odd goal here and there.