I remember asking Dario the same question at HT about three or four years ago why we didn't leave one or two players up near the half way line and he shook his head and said every team does what we do. He was just the Director of Football LOL...I also remember we used to have Dean Ashton and Steve Jones doing exactly that and scoring many goals in the process. Its just logical to anyone with a brain that if you leave players up near the half way line they have to leave more than we have ie three if we have two up etc. It also gives more room for the GK to get access to the ball.