There's gray, black, white, red, albino, and blonde coyotes as well as a mixture of all the colors and some live in central park in NYC. Location and color is not the only determination. And it wouldn't be the first time a bunch of people were certain about something but in fact were wrong (remember you were certain it was a kit fox at first)
BUT, you shot it and saw it first hand, at least in the pic it is way too big to be a swift, and sure as heck looks like a gray. IMHO
Either way they are great lookin dogs, good job
Im Out
Fin