According to George Harrison, The Beatles kept each other’s egos in check. George once said that he felt bad for Elvis because he was the only person who knew what it was like to be The King of Rock ‘n’ Roll. However, the Fab Four didn’t have that issue. They had each other’s backs and depended on one another to get through, even if that meant they had to tell each other they were getting too big-headed.
Source: cheatsheet.com