My condolences. I lost one of my own a few years ago. It still hurts.
As to the skinwalker: whether it was sicced on Morgan or sniffed him on it's own is irrelevant to my point. Even whether it was sentimental towards it's own kind (debatable) or was acting purely as a mercenary.
The skinwalker was on Morgan's trail for a few hours when he plopped on Harry's doorstep. Not for nine months. A skinwalker would not commit a year or so to one scheme for just one payoff. Not unless it was one huge, cosmic level payoff.
A single, horrifying night that pays off multiple ways by itself? That seems more like it's style.