The rule is this....IF in the 3rd Quarter or before, the emergency QB is used (Gutierrez) neither active QBs can play in the game from that point on. That is only for Quarters 1, 2 and 3....NOT 4.
In the 4th he CAN bee used without that penalty. Cassel was in the 4th, so this rule does NOT appply. Another case of so called knowledgeable sports people knowing nothing...Iam surprised Holley did not know...as he's on top of things a great deal. Basically, the rule is there to get an emergency QB in the game IF QNs are injured...and the rule is used so that it will ONLY happen in a real emergency. I ahve only seen it come into play once, and that was in a Pats Jets game...when Tupa was with them. (laye 90s?? Pete carroll era??)