I also brought it up mainly to pass the time as we await whatever depressive mediocrity remains this offseason, although I'll be curious to see how the situation(s) play themselves out. In general, I just think it's not the ideal fit: we couldn't get Andujar when we wanted him and in part got Moran largely for that reason. When you add in the fact that Hayes is our top position prospect, it's just not the right target. I think there are some interesting possibilities, and in general only started thinking about it just because our offensive possibilities are so limited for next year and beyond, but these possibilities would pretty much need to involve spinning Moran for some value elsewhere, as well as a potential different landing spot for Andujar defensively.
I don't necessarily think the book is written on him defensively, but when you start getting into these further contingencies, things get messier. And these things are maybe symptomatic of the entire problem: Andujar could certainly displace Bell, for example, as offensive production should play pretty much anywhere. But whatever situation you try and play out, the logical endpoint is trying to reshuffle a deck of mediocre-to-possibly-ok MLB pieces, which aren't going to do it. You could move Moran or move Bell and probably get reasonable MLB talent back, but it's a lot harder and you'd have less of a position of strength to deal from.
The better approach is fairly obvious, which is that you hope Hayes rises even quicker to force the issue, and then are hopefully figuring out how to reorient the approach from the perspective of your home grown talent that might be more impactful. Realistically, that's probably also the path to take with Keller and the prospects of eventually flipping a pitcher. Right now is not the ideal timing, unless there's some kind of pretty surprising two or three step plan NH has in play, which... can't see it.
The Yankees situation will be interesting in general. I can't see them having a ton of leverage in moving Gray, even though they should be able to get a decent prospect or two in a deal. I'd like to see us involved if for no other reason than it would be a smaller gamble that could pay off: it's possible that he could complete fall off or get injured, but a slightly revamped, NL Gray could help boost a good pitching staff to the next level, and another outcome in that scenario would likely be getting almost the same kind of value in a trade deadline package if we are too far out of the picture or Keller really emerges or something. The Yankees also could add Andujar to the mix, and while I'm sure that could probably entice teams (and perhaps the Reds would be an ideal match there, budging on Trammell in order to get a pitcher and an immediate offensive impact player, even if they have to put him in LF), I still don't see them gaining a lot of leverage.
Regardless, getting involved in the Gray mix and gambling that you might be able to get 3.5/4 WAR out of him seems like one of the few ways to bolster next year's team beyond the solid/average idea of someone like Ahmed or Galvis. Can he be had without even discussing Keller, Hayes, Cruz? Obviously you'd hope so--I'd expect none of the middle infield carousel to really interest NYY, since they'd have to roster them, but the tier below our top prospects is pretty stocked with 45 FV guys, and I'd assume that Escobar, Mitchell, or Reynolds and a lower list flier would be able to get the job done. After all, the original package for Gray was hardly amazing, and now NYY has committed to trading him and he only has one year left.