Weren't there some mention of a person who has someone else as a rival not necessarily being their rival.
I think that's Raiden and Cole.
I almost think Cole's rival should be Evil Cole. Seems obvious to me, but I suppose Raiden works too. And surely both the Cole's should then be Raiden's rival, it is the same guy after all. (I suppose a Raiden player has his work cut out for him then but whatever.) Also I suppose Raiden and Fat Princess as rivals doesn't make any more sense.
Evil Cole and Radec
Fat Princess and Sir Dan
That definitely seems to work better...
They should've made both Cole's rival each other. That way, it could've been representative of his inner struggle between using his powers for good or evil.