Alternately, there's always the possibility of artifact coins whose results can't be interfered with by any means. :P But I think it more likely that our various overlords were able to more peacefully resolve things by talking them out, at least most of the time.  And they probably ultimately wound up considering one another as genuine friends, which then feeds more into why the forces of good had to split them up in order to take them out, and why they're more willing to work together now, once they recover their memories.