They all wanted to be Brando...admittedly so.
Go educate yourselves... READ! Newman, Dean, McQueen, Pacino, Nicholson, De Niro, etc. These type of actors never came on the scene until Brando came around. He was the first, the template, the standard, the man who changed Hollywood and the world. He was rock 'n roll before there was even the music. It was based on his performance in the Wild Ones...sideburns--Elvis, Beetles--John Lennon, brooding look--Dean.
It all came from Brando. He changed the culture and defined what "cool" is...
He was basically GOD.