When there's no room at the top for them, your employees may leave you.
My client in Minnesota called for help because three of his top managers gave him two weeks notice: His estimator who came to him nine years ago as an apprentice, one project manager who came as a plumber five years ago, and a job superintendent who was with him for three years. All three gave him weak reasons for leaving but he felt something else had to be the cause.
I talked with all three separately. As you may have guessed, all three gave me the same story.