This model is actually the standard mode for Neo-Folk. I cannot at this moment think of one Neo-Folk group, especially not one major one, that is not driven by a single creative force surrounded by a slew of semi-anonymous supporting musicians: Dave Tibet for Current 93, Tony Wakeford for Sol Invictus, Douglas Pearce for Death in June, Kim Larsen for :Of The Wand and the Moon:, etc. etc. The only ones with fixed membership are mainly solo projects or romantically involved/family duos like The Moon Lay Hidden Beneath a Cloud and Changes. You also find this thing a lot in progressive metal, though it's more likely there to set up a different band-name for each line-up (This is why Dan Swano has been a member of about 30 or more different bands. Most, frankly, are just him bossing round different groups of musicians in different genres.) See also Arjen Lucassen and Devin Townsend.