From my understanding and talking to the host, there is a ceiling of having 4400 for an individual player, so if you have a player that is 4800 +, they can not compete because this is a tournament for amateurs only and to make the games fair. Any team can be capable of pulling a 5k player to play for them, but that would be unfair. So it's more a tournament just for amateurs.
So your average teams solo mmr is still under 4100. Maybe if you will to to the host and see what he decides im sure you guys can work somethings.