Umps hand signals on "A" counting

[BayouUmp]

7-2-1: After the ball is ready for play, each "player" of A must have been momentarily, within 15 yards of the ball before the snap.

I believe the intent of this rule was to prevent a Hideout WR from entering the field just prior to the snap and being uncovered. If A11 enters the field and comes within 15 yards of the ball and then takes position in the formation, you got nothing.

If A11 enters the field and never comes within the 15 yards, you have Illegal Procedure. If this same player had left the field during the same dead-ball period and then re-entered, you'd have Illegal Sub.