Fascinating stuff, RM. Thanks for drawing our attention to that intriguing research. But as for the word, I'm not convinced it qualifies for our list. It may do so one day, but it doesn't now seem to have a strong enough place in the language.
It's true that some of the words we do allow are known to very few people nowadays, but they're still part of the English language, and can still be encountered in old books and poetry. Newly emerging words present more of a challenge, because their future status is necessarily a matter of speculation. Occasionally we admit a word that hasn't yet made it into the dictionaries, if there's clear evidence of its usage, but I don't see that yet in the case of decloak.
