grandtanteJE65
Would anyone care to explain more fully?
I may be missing the point here, but quick, quicker and quickest are adjectives, whilst quickly is an adverb.
So what is this post really about?
I think it's about qualifying adjectives. The 'rule' (if such things exist and they haven't changed, which I'm sure they have) is
Adjectives with one syllable: add -er -est. I.e. quick, quicker, quickest.
Adjectives with three or more syllables: use more or most. I.e. more feminine, most feminine.
Adjectives with two syllables: it depends.
So it shouldn't be "more quick".
But with adverbs it's different as you point out, I think though sometimes it's unclear if the word in any given sentence is modifying a verb or a noun.
But maybe I've misunderstood.