[William Cloud Hicklin]

Well, although the term "Avari" only entered the vocabulary with Quendi and Eldar, the description in F4 fits them to a tee: "hearkened to no summons to the Sea;" or perhaps rather, given the lack of a statement of active 'refusal' but including "content with Middle-earth remained there, and remained long after, fading in fastnesses of the woods and hills" it appears we have the Lemberi or 'Lingerers' of the Lhammas again.

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I'm not one to try to draw bright lines of 'canonicity;' I think ultimately the legendarium is its history, and changes and inconsistencies are part of it. Given Tolkien's way of working andf constant changes of mind, I don't think it's helpful to set up one dustbin of "posthumously-published works" that includes everything from vague sketches about the Dome of Varda, speculative essays like 'Orks', and works like Quendi and Eldar which were never intended for publication but rather as 'background' or 'lore' for JRRT's private purposes, and which were I think intended (at the time of writing) to be 'definitive' (allowing of course for the transient nature of 'definitive' when we're dealing with JRRT!

I also wouldn't put disproportionate weight on 'dogs that didn't bark' in the Revised Edition, which was after all not a comprehensive overhaul but a quick-and-dirty job for the purpose of regularising the US copyright. Some things T happened to have in his head and was happy to include, like the extended account of the Kinslaying; some were fairly 'easy' name changes like Finrod > Finarfin (tho he was imperfect even with that one). But T in revision hadr a tendency to pounce upon particular things that caught his eye, not a systematic approach at all. Certainly it's the case that he had definitely changed his mind about the Silvan tongue, even if he didn't amend App F; his Letters are unequivocal.