Every human being from the beginning of time till this very moment has an ego and the more they climb the ladder of success no matter what the sphere of activity is the ego will grow and get bigger, but ego is not always terrible if they know how to manage it if they recognize it for what it is, for what these guys do for years and all the years it took to form their skills it's almost impossible not to have an ego once they have their breakthrough and success. Personally I know people that have a huge ego and they've accomplished Nothing in life so imagine those who have and are accomplishing something great whether it's music, Sports Etc.