I consider Aaron Burr to be as much of a lead as Hamilton, particularly as played by Odom Jr., whose performance is one of the highlights of the season. Burr is key to the story, appears from the very beginning and gets some of the best numbers. He has more solos than Hamilton too, right? He belongs in lead as does Soo.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"