What’s marlon Mack’s value?

Offered Michael Thomas, Marlon Mack and Cooper Kupp for my Alvin Kamara and Crabtree. Full PPR.
RBs- Mixon, Kamara, buck Allen, foreman, McGuirre
WRs- Demaryius, Crabtree, Dez, Pryor, Jordan Mathews
I know my team needs an RB1 but my league is difficult with trades and this could give me more trading power…