Yes but thats a very different game. 45 players with unlimited rolling substitutions and specialists in the various different set pieces (yes I know we have scrum specialists but they don't get subbed off immediately after a scrum like in American Football).
Part of this is a separate defence and attack, would you put the defence down to 10 but not the attack? Special teams? A lot of ejections are miscreants from the sidelines getting involved when they shouldn't. Very different game and not really comparable.