if the game had a couple of players coming off the bench i would except the coaches decession. every other game has that basekball, soccer, league, rugby. but for a team game that treats offense and defense as a separate role is not a team game in the traditional sense. but when have you guys been traditional. you turned rounders into professional sport (baseball) and chucked a ball into the game bull rush and called it gridiron.
but hey it all works you have massive crowds to your games, and your professional atheletes are the highest paid individuals.
no offense and goodluck with making them world games. it only requires marketing and world dominance.