Thought so. Just that I'm seeing a few incomplete triangles above. Like Barrera-Morales-Marquez and Mayweather-Hatton-Pacquiao.
But it's still a triangle because 2 out of the three fighters fought each other. Like something in common, degree of separation thing...
This must be the best 4 way for sure. Best three ways must be Ali - Foreman - Frazier. A good 3-way isn't .. A > B > C That is just boring an common. A good 3-way is mixed up. Like the Ali-Foreman-Frazier one.. Taylor-Pavlik-Hopkins is also a real 3-way.
Langford-Jeanette-McVey-Wills Moore-Burley-Williams-Marshall-Chase is pretty epic Murderer's Row **** Corbett-Jeffries-Fitz Ross-McLarnin-Canzoneri Griffith-Benvenuti-Rodriguez McCallum-Graham-Jackson Eubank-Watson-Benn