Wings on the field

[Dommer1]

Off on every play, wider is better. If you are on the wings, and have to move backwards at the snap, you are without a doubt putting yourself at a disadvantage. It's a lot easier to move forwards and to do your job, then to move backwards and worry about the sideline, tripping and what have you.

Actually, there is seldom reason to come in onto the field during the play, even if you are outside the sideline. I've tried both (before our mechanics mandated a starting position at the sideline), and there is no question that you put yourself in a much better position when you stay outside your sideline, even if it's a 4-man crew.