I don't see that as a concession if you were already with state in thinking enfp.
I've thought about, internalized the possibility of Mark Smith being istp rather than intj over the summer: his "dripping"/lazy aura with the scatteredness, forever rotating cast (surface-wise, suggestive of Pe tendences). There is a certain playfulness he exudes, a darkly tinted hint of naive joy. But! Have you listened to them? After these first few sentences, I don't think in my wildest dreams that anyone but a dom-intuitive could come up with the combinations, concoctions he has with great consistency over the years (which in itself suggests great ease in expression of his inner hologram Pi-ness). I can think of a few istp musicians of the top of my head, none of whom are as comfortable disassociating from the self through their work as Smith is, who warps existing/standard ideas into lurching hologramed nightmares, howling with insane laughter all the way to immortality (or maybe just into the next millenium).
(I'm still open to istp. Maybe once we verify additional artists and identify who was/has been influenced by whom we'll have a better picture, because, as so many posters here will testify, mbti isn't terribly accurate when simply matching preference for preference.)
Once I'm at a computer on which I can hear sound, I'll get back to you on Merritt. Still feel like I have a good case.