There's two points of view on the OS, the one from pitchside can be frozen to show that David was onside, using the lines on the pitch as a guide as he was exactly on a line as the ball was kicked. The looking downview is difficult to freeze at the exact point of the ball being passed which just proves how difficult it was for the lino to decide. It was a lot closer than portrayed on TV with the white line being drawn. In one second David moved 7 yards, a blink of an eye. Looking at the 2 screen captures I've made, it's impossible to freeze at the exact point of contact and between the two frames he has moved a yard. F he was offside at the point of contact with the ball then it was inches, which imho is more than within the margin of error.