My amateur opinion is that we need better "man management." Rocco is supposed to be a good "players' manager," but the sense I have of his style is that he never pushes them or makes demands. That's good when it works, but sometimes the "Oh, well. You did your best," approach leaves a lot on the table.
I doubt that Tom Kelly ever hesitated to call his players out when they underperformed. Some players need that. The Twins' stars seem too complacent. Maybe Rocco gives them hell sometimes, but you never hear about it or see it in his interviews.