On the scrimmage kick numbering exceptions:
That's interesting that the snapper's hands don't matter now - position is established when he takes his position, i.e., lines up over the ball. There will be coaches who are going to try to take advantage of this change and get cute trying to move players around, and won't realize that 'hands on the ball' isn't a criteria anymore. I do wish they'd clarify in the rule language that taking his position means just that - not hands on the ball (it's in the AR). So as I read AR 1, as soon as he is lined up, no movement, no motion (of the 2x2 personnel). I'm not sure I understand why this is a live-ball foul, I'm not sure how, if they can't move, and they do, that it isn't an immediate foul? How can they remedy that (moving prior to the snap) when they're not allowed to?
So, as I am visualizing this, for a swinging gate, we have to make a mental note of the numbers and make sure we have 5 lineman. If there are not 5 lineman = no swinging gate is legal, since the linemen can't move once the center has taken his position. From AR 5, they can line up this way, they just can't shift into a swinging gate (without 5 numbered 50-79).
Anything I am missing?