Just so no one gets mislead by another thread, a “swinging gate” formation does NOT qualify as a ‘scrimmage kick formation,’ since it is not obvious that a scrimmage kick will be made. That IS the rule, and Shaw has reinforced that in a recent set of video plays.
When coaches tell me they will run the swinging gate, I remind them they must have 5 linemen numbered 50-79. They usually say, yes, they do. But, we still gotta check.