Trying to trade for Gronk.

This is a 12 team PPR league. This guy is struggling at RB. I picked Lacy up off of waivers yesterday. Who should I offer for Gronk? I tried Lacy and J. Thomas. He wants two RB from me. Here's what our teams look like.

Me:

QB:Rodgers, Dak
RB: Blount, Gore, Hyde, Lacy, McKinnon
WR: Nelson, D. Thomas, S. Shepard, Dorsett
TE: J. Thomas, M. Bennett
DEF: Buf, Jets
K: Vinatieri

Him:

QB: Cam, Wilson
RB: Drake, Howard, Henry, Sproles
WR: Cooks, Fuller, Sanders, Austin, M. Thomas, Boyd
TE: Gronk, Allen
DEF: KC
K: Santos