The coaching relationship is a dynamic phenomenon between the coach and the coachee. The coach generally possesses knowledge, skills, experience, and perspective that the coachee does not yet have (and needs or wants).
The coach-coachee relationship is just that -- a relationship. The coaching process works best only when that relationship exists on a presumption of volunteered participation and grounded in TRUST. If either the coach or the coachee are externally "compelled" to participate, that trust suffers erosive effects from the get-go. The prospect for optimal outcomes are diminished from the start.
As leaders, we often find ourselves wearing both hats -- coach and coachee -- at the same time. Thus the coached-coaching experience is not hierarchical, but rather, multi-directional. There is much we can learn from that interpersonal schema, if we are paying attention.
Perhaps we should spend the preponderance of our time on becoming relationship experts.