It seems like there are several Rumbles that have either happened so often or are so clearly one-sided that there's already an accepted outcome (the one example I see a lot is Cassandra Cain vs. Bruce Wayne; Cass Wins). Have these ever been collected? I think it'd be a good idea to have a general reference point. I'm not sure an outright ranking system would work, there's too much of a paper-rock-scissors mechanic involved, but a simple list of 'If x fought y under z conditions, y will win'.