The Celtics have been doing business like this for 55 years. In a 2-2-1-1-1- series, they take ownership of Game 5.
Game 5 is a mini-7. Teams that win Game 5 in a 2-2-1-1-1 series go on to win the series 83 percent of the time. A very disproportionate percentage of that 83 belongs to the Boston Celtics. Game 5 is damn near as important as any Game 7. Ask Larry Bird, who used to conduct annual seminars on the subject.