Always read your posts...you aren't lazy and you generate thoughtful conversation, and you touch again on an insightful thought regarding how 'we' learn in our business pursuits and how that applies to coaching.
Now, I know nothing about coaching, but as someone who started at the literal bottom of the 'totem pole' in the mud and snow on a drilling rig, I used every engagement I had as an opportunity to build my own base of knowledge in pursuit of my aspirations of building companies, and while I had some great mentors that I learned from, I also learned a ton from the 'shitbag' bosses I had.
I would hazard a guess that there is some relevancy to this phenomena in coaching as well.