Three has always been tougher than Two. Think of any of your famous threesomes. The Three Stooges? Look at the anger there. My bet is that before Curly was born, Moe and Larry could play together for hours without even a single poke in the eye. Huey, Dewey, and Louie? Donald Duck never had a moment's peace. The Good, the Bad, and the Ugly? I rest my case.