No matter how in sync two people might be, there probably doesn’t exist such a concept as a perfect co-worker. At least not one with whom you work with side by side routinely. That applies as well to professional sports as it does any other field; I’m sure there’s not a quarterback in NFL history who hasn’t occasionally taken issue with his offensive coordinator.
Take former Pittsburgh Steelers quarterback Ben Roethlisberger, for example. He may be good friends with Bruce Arians, but they would butt heads, certainly. He was also very close with Randy Fichtner, his most deferential, but not always his greatest advocate for success.