This is to address the question in this thread: Why wasn't Metaphysician banned for plagiarism?
First, what Metaphysician did:
Metaphysician credited the ancient third-century philosopher Zosimo for inspiring all of Sarkicism. His attribution:
The inspiration for this group comes primarily from the occult/alchemical writings "The Visions of Zosimos". http://en.wikipedia.org/wiki/Zosimos_of_Panopolis
Turning what is meant to be a strictly symbolic dream sequence into something much more literal.
And here:
Oddly, flesh beasts aren't even my thing normally; it just turned out that way when trying to come up with a literal interpretation of some old alchemical (specifically the Visions of Zosimos) and Gnostic texts.
Metaphysician also copied exact text from Zosimos, from the aforementioned "Visions". He did not explicitly credit this, or indicate that he took the philosopher's exact words and placed them in the mouths of ranting Sarkic characters.
Because of Metaphysician crediting the source as inspiration, it was an obvious possibility, to many of us, that Metaphysician copied the philosopher's texts as an "Easter egg" / "Genius Bonus" for those who've read the same material as he has.
To steal examples from TroyL: This is roughly equivalent to quoting an obscure Bible verse or passage of Homer that only those "in the know" would recognize.
This is plagiarism in the technical academic sense, and would be beyond the pale in academia. However, while most of our site members (including staff) have a background in academia and no background in fiction, we are still a fiction website. And this wouldn't be considered plagiarism in published fiction; if you look at any plagiarism scandal in fiction, it's about copying current authors and passing their work off as your own. Ancient texts are freely referenced, lifted from, etc, and their fan base only tends to grow when people figure that out because there's nothing nerds love more than obscure references.
A good example is True Detective, which lifted whole-cloth passages and elements from "The King In Yellow", to the delight of fandom (and disappointment when it became clear that the creator had no intention of taking even more). The creator did not acknowledge the inspiration (unlike Metaphysician) until people noticed the references — and with a wide audience (which Metaphysician's work also has), it was obvious this was intentional. Technically plagiarism, but no one would even think to call it that. True Detective was lauded for this lifting of elements.
(Incidentally, there actually was some actual plagiarism controversy about True Detective lifting passages from Thomas Ligotti — but that's a contemporary author. No writing community consensus was reached there, that I'm aware of.)
EDIT: Interesting, related reading: http://www.slate.com/blogs/browbeat/2014/08/06/true_detective_plagiarized_no_nic_pizzolatto_did_not_plagiarize_thomas_ligotti.html
I would've been fine requiring the author of True Detective to attribute, but not fine banning him, to carry this analogy further.
All of this means that my assessment is that anything beyond a warning (possibly not even that, but I do not wish to adjudicate that) would have been inappropriate in this case, unless Metaphysician refused to attribute the text, or we somehow determined his intent was certainly dishonest (aka, intentional plagiarism).
My assessment is backed up in broad strokes by our only actual real-world plagiarism expert, TroyL. (For what that's worth — since TroyL declines to further weigh in on this situation, as he is retired. So much for my Appeal To Authority!)