The Roman army had three layers: the legionnaires (the rank and file), the centurions (junior officers), and the generals (senior officers).
And of these three, it was the centurions who were considered the linchpins. Without them on board, nothing worked.
And that pretty much holds true today. Unless your sergeants and lieutenants believe in your campaign, don’t expect victory.
And wouldn’t you know, what works in the military also holds true in business organizations.
As you get more experienced, you realize that the world doesn’t change much, even if the venue does.