And in a nutshell that is why this is my preferred place to talk baseball, as I have been arguing essentially this on nyyfans just now but with multiple lengthy posts and not getting much agreement. Then I come here and see that you have essentially expressed my perspective on the matter in under 20 words, well done.If they can get Happ for Drury then that would be a steal. He's useless for this team.
I'm not especially pro or con Happ, I actually think that if they get him and they can get value back for Gray (both MIL and OAK are evidently hot for him, MIL has his Vanderbilt pitching coach and OAK of course was where he was great before), I would move Gray and keep the 5th spot open for some combo of Cessa/Sheffield/Loaisiga as it is now. That probably doesn't help so much this year (although I'd much prefer Happ in a postseason game to Gray) but it gets them out of the last year of Gray's deal (probably $9-10M range) and allows them to try to upgrade that spot for 2019 (Patrick Corbin?).