Broadway is all hands at showdown. Has been for a while. It's very much to prevent collusion.
It seems a strange rule though and not generally in line with most other Casinos tournaments
I can understand it would make more sense in a satelite where there are so many seats guaranteed .it would stop the leader dumping to his mate but in a small local comp its borderline pointless in my opinion
still house rules are rules as long as they make players aware