IMHO, I respectfully disagree. While AB's 1 & 2 are correct, the snapper is in the game under the numbering exception as they are not 5 linemen numbered 50-79. If #80 & 41 had linesman numbers, the numbering exception would not be used and the snapper would then be eligible.
I, like some of you, like A-1 Sauce on my steak. I ,like most of you, didn't like an offense by a similar name. I proposed to adopt the NCAA rule that read something like, "...the numbering exception is allowed only when a scrimmage kick is apparent." Apparently that was too simple and we've got what we now have. It can become very confusing. Sorry.