> Shamans who become not so much the custodians of a human community, but a community of spirits instead.
Ah yes, but that's still a community; it's not one person using the spirits for his/her own benefit.

> So it does happen, in Indigenous culture at that.
I tried to make sure to include that I was only vaguely familiar with some native american stories, because the term shaman is so unspecific (was the common ground around the world being able to enter an ecstatic state to travel to a different world?).

I think I've also heard of shamans that have been ostracised, but then usually their spirit/body/powers warp as a result if my awful memory serves.