I've noticed in CFB games this season that an official will stand over center until the defense has been allowed to sub in players after the offense has subbed in players. And I've started to notice that the subs on D aren't sprinting out but instead are leisurely strolling out to their position.
My question then is: what's to prevent the D to use up all/most of the play clock when subbing in after the O has subbed in thus creating a delay of game penalty on the O?
FR-60: PENALTY [c-d]—Dead-ball foul: Five yards from the succeeding spot
e. When Team A sends in its substitutes, the officials will not allow the ball
to be snapped until Team B has been given an opportunity to substitute.
While in the process of substitution or simulated substitution, Team A is prohibited from snapping the ball.