Why would Tyki and Wisely be in their Noah forms on that page? I ask this genuinely, as I had thought they were trying (however poorly) to blend into human society the same as Fiidora? In that case, their human skin tone would be dark, whether or not their Noah forms still have gray skin.
Anyway, I was upset because people like to exaggerate the idea of "Tumblr fandom" as rabid sjws who think "the wrong way" somehow. Tumblr discussions happen there exactly bc few other sites are interested. They're interesting to the people who choose to participate in them. Why would everyone else suddenly be obligated to care the same amount about implications in Hoshino's coloring (that is to say, not at all)? They're not, for the same reason you don't feel required to care.
There's no objective answer to brown or grey skin tone, like you all alluded to yourselves. If some users choose to consider certain things canon or not for any reasons... that's not anything you can change for them. Just because you or anyone else doesn't care, it doesn't mean that people who care a lot are wrong for doing so. Disengage or participate, there's no need to go to other sites and snootily talk down "Tumblr fans". The butthurt people have over Tumblr is very :U for me.
Raw scan (resized for Tumblr, if anyone is interested, the 600dpi scan was 22MB and 4460px or so wide) and a really rough clean done in the hour and a half before my lab this afternoon. If anyone feels up to tackling the full-scale cleaning, I can send you the file.