Dreadball MVPs

Recently I painted up some Dreadball teams from a starter set for a client. The next lot of miniatures from the client was the Dreadball MVPs. Now since I don’t have the game (yet) i’m not sure how the MVPs are used when it comes to teams, do they favour or cn be used be certain teams or can anyone use them. Just to be safe I didn’t want to paint any colours that might align them to the wrong team so I stuck with the same colors used by Mantic for their MVP players.