Mack for Bell trade

I was offered Bell and Dede Westbrook for Mack and McLaurin. Fair trade
My current team is

RB: Barkley, Conner, Mack, Kerryon, Henderson, Edmonds
WR: Julio. Ridley, Boyd, D. Robinson, Campbell, Hardman, K. Johnson, Mclaurin

Westbrook has dropped off with Gardner as QB he seems to like chark the most on routes. I don’t see the value in the trade on your side