I noticed a partial theme to the rotten four and sea three.
The majority of RF have magical parents (Maleficent - obvi, Jafaar - sorcerer/genie, Evil Queen - witch/potion maker) while the majority of the ST have non-magical parents (Catain Hook, Gaston).
The pattern is that both groups have one misfit Carlos (non-magical) and Uma (magical).
Story ideas:
Carlos and Uma have always been in the other group (Uma in RF -Mal and Uma rivalry-, and Carlos in ST -Harry is captain with Carlos first mate).
Ben went for the evilest villains' children, however doesn't know who is in who's gang. Chooses Uma instead of Carlos.
