Trade my Kamara for Dalvin Cook?

In a full ppr redraft, I have Mattison and I offered him to the Cook owner for Latavius Murray, to have as a handcuff for Kamara, however for whatever reason the trade was rejected. I would really like to keep Kamara but should I offer him for Dalvin Cook since I have Mattison?

The rest of my rbs are Aaron Jones, Singletary, Hines, and Edmonds.

Thanks in advance everyone !