If they gave up the faster shrine boom and decided to build a wall, it could be delayed enough. Yumi is the second most powerful archer in AOE3 after LB and has a range of 18, making it easy to block enemy troops behind the wall. And if Japan does not fall to the point where the initial attack lasts for 20 minutes, the side that usually faces Japan will have surrendered.
I don’t understand the connexion between your comment and my ^^, i explain why looking the winrate only is a mistake, nothing more.