Cahill had Laursen and Mellberg in his way and didn't want to stay as a reserve, £5mill was ok at the time. With hindsight it would have been nice if he had stayed, but I don't think currently he is any better than Dunne, Mellberg, never mind Laursenpre retirement. Clark is a bit like Cahill/Phil Jone, good footballer but with a bit to leanr playing cenre half, he will eventually become a top centre half imo though. Cuellar imo is marginally better than Collins so is unfortunate not to get more game time, but hey ho, i dont lose any sleep over it as I think there is very little between them.