I don't think he was putting Cooper down, just pointing out that his personality type is such that you probably can't look to him as having the intangibles of a team leader and assuming that mantra. He doesn't have Josh Allen's personality and you absolutely need those intangibles from a few players on both sides of the ball on any championship team. But not everyone is wired the same way. Usually you look to leadership qualities as an important component of your QBs psyche but even here there can be exceptions. Eli Manning was a very good QB and a competitor who was sometimes criticized, even by teammates, for not showing enthousiasme.
What Cooper can do, has always done, is execute his responsibilities at a high level. We don't need more leaders but we absolutely do need what Amari Cooper can do.