I think this idea could get somewhere but i think that having 5 people control one tori would be a little bit overkill. Imagine your in a really tense match and one person decides to be a dick and won't extend a knee causing you to lose a match. Also, how would you be able to implement events and duels and bet servers and belts and rank and many more things if your not in full control of the tori. Even if you do the right thing, you can't lose rank for a save you couldn't create.