Gronk-worthy Trade Targets

I’m looking to ship out Gronk in a full PPR keeper league (I was able to snag Burton very late in the draft so I’m good at TE)

What is the highest targets you would trade Gronk for? I’ve gunned for names like Kamara and Melvin Gordon, but no one is willing to move on him, even when I involve higher end names like Keenan Allen.