I would hold off on using Gronk as a trade piece if you can help it. Personally, I’m going after him in leagues in which I don’t own him. If you’re gonna move Gronk-- whom you probably drafted in the 2nd/early 3rd-- I would wait and see if he goes off in the next week or two and try to get a better ROI.
Cuz let’s be real, you’re not dropping him even if he puts up another couple disappointing weeks and it can’t get much more disappointing than this last week so essentially theres nowhere to go but up.
I would be totally comfortable rolling out Murray (who IMO will bounce back this week-just traded for him) and McCaffery (18 more snaps, 5 more targets than J-Stew) especially if I had the insane upside of Gronk in my line-up, most ESPECIALLY considering he plays that awful, terrible, very bad NO defense.
Finally, the fact that you have Doug Martin coming back in a few weeks somewhat mitigates long-term concerns.
If you find you’re set on making a move using your WR depth K. Allen and Thielen are the two I would try to package
Basically that was a super long winded way of saying just hang tight for now.