It makes little sense to risk career success and material reward except for a larger purpose the leader finds compelling; clarifying the values that orient one's life and work and choosing between purposes that are all legitimate, giving up many so as to serve one or a few, is what makes the risks of leadership worth taking and is itself a courageous act. Purpose is what lets a leader stay connected through the losses adaptive work distributes.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.