I think the answer is relatively straightforward. The NHL wants the team to remain in Glendale. If they can arrange that with an owner they like and without losing money in the transaction, they will do it. If they can't, then they will sell the team to recoup their money to an owner they like who will relocate it to a place that they support. Right now, the ownership group that they appear to like is TNSE and the location is Winnipeg. That is what all of the evidence points to, despite how this galls so many who seem to have deep concerns about how this will "harm" the NHL.
From my perspective, in part, you're saying essentially the same thing that I did. The League may have suggested that Winnipeg should get the Coyotes if they have to be moved, but I seriously doubt that the League is really keen on the idea. It's an option of last resort.
On the other hand, let's hypothetically say that there was a viable arena in Seattle, and that someone had stepped forward to move the Coyotes there... This Coyotes thread wouldn't exist, as well as many before it.
Simply put, there are very few attractive locations available these days, and virtually none that's being offered up as potential relocation options.