On the last play (#36) of 2016 Game Video Review 3 RR states that the Right Tackle is "in the backfield" and the foul is that there are too many players in the backfield.
Indeed, as per Rule 2-27-4-a-1 the RT is not a lineman because he is neither the snapper, neither does his "head break the plane of the line drawn through the waistline of the snapper".
But as per Rule 2-27-4-d-1 the RT is not a back, because his "head or shoulder breaks the plane of the line drawn through the waistline of the nearest Team A lineman".
So I would think the foul here is not against Rule 7-1-4-4 ("No more than four players may be backs."), but against Rule 7-1-4-2 ("All players must be either linemen or backs.").
Going one step further:
#44 is a back, because his "head or shoulder doesn't break the plane of the line drawn through the waistline of the
nearest Team A lineman" (being #88).
However, #28,
who is on the same yardline as #44 is not a back, bacause "head or shoulder breaks the plane of the line drawn through the waistline of the
nearest Team A lineman" (being #55).
In my opinion, this also would be an illegal formation as per Rule 7-1-4-2.
Or am I getting too technical on this?
