This can happen in any tournament with any organizer. There are no "Best Practices" books, only experience and there are so few available to look back at. If someone has a complaint or is going to accuse someone of any infraction and expect results you have to be prepared to make the complaint official. The rules state that any complaints of accusations must be formal and signed by the person who is making the allegations. If no one is willing to own it then the organizers hands are tied. The old "I don't want trash my buddy" scenario doesn't work if you want action.