I feel like it was done because they were left over, which is a pretty poor reason.
Honestly, I'd have preferred if Evil Cole and Sir Dan were switched, so it was F.P. and Dan as rivals (princess and a knight), and Radec and E.Cole as rivals (both ruthless and evil), which makes more sense.
Only thing I'd change about the rivalries, mind, and even then I'm sure seeing F.P. and E. Cole fight it out will be hilarious.