"We could Test it and Have The MM boost nothing for the whole game, but this also means that’s the MM Cannot Get the Zone Target."

I think one possibility could be that the other players need to try and keep their own zone scores low, similar to the regular MM mode, where the other players would also lose if one of them would reach the score target. Believe me, I've managed to keep my zone score pretty low throughout our sessions, just spamming barriers and crashing into barriers :-D