For an obscure poet to have penned such a refined, poignant sonnet is not at all (i). The sonnet, after all, has been a favored form for hundreds of years amongst the amateur and lionized alike. I would be (ii), on the other hand, had not one, out of the sheer number produced during this time, surpassed Shakespeare on a bad day.
Blank (i)
rare
puzzling
conceivable
Blank (ii)
confounded
vindicated
hard-pressed