Dak Prescott Value in a trade, Owner lost Ekeler

I want Dak, the owner has Ekeler so I am hoping he will want a RB to replace him. Only other starting RB he has is Henry. (1/2 PPR, this is a keeper league)

I have Josh Jacobs, James Robinson, James Conner, Antonio Gibson, and Leveon Bell. Who should I give up for him, or look to offer?

Next year
Conner I could keep at 9th
Robinson I could keep at 13th
Gibson I could keep at 4th

Dak would be keepable at 9th also