I think Cahill is obviously a major part of the team when playing 4-5-1, i doubt anyone could argue otherwise.
But we carnt play 4-5-1 forever if we are to progress, not the way we do anyway.
Its just not offensive enough
I just carnt see Chaill playing in anything BUT a 4-5-1, he doesnt have the skills..
Agree though Moyes must find it hard to resist playing 4-5-1 sometimes, especially when we have taken to it so well.