Well yeah, if only one player hold the Paradigms system.
But if every player could use their own Paradigms, they could change into whatever role they desire, not limited in person.
So example Lightning change from Commando to Ravager, Snow is Sentinel and he still will be Sentinel unless the player who picked Snow change his role, so doesn't change other party member role in CO-OP system.
Well yeah that's about it, I think