While playing around with Guard recovery ideas against standing passers the other day I realized how much I neglected going for the neck.
My training partner and I concluded a neck contact point changes everything the most dramatically through nullifying the top players ability to rotate (back-step), move backwards, as well as the sweetness of adding your bodyweight to the rest of the contact points. To demonstrate, watch how everything shifts in this Pedro Sauer teaching clip when Sauer get a lapel grip @ 1:51:
Broadly, this principle applies EVERYWHERE. When in doubt protect ya neck and assault theirs. ;o)