OBJ for K Johnson's and M Mack advice

So this is my current team below and someone is offering me OBJ for M Mack and K Johnson. Is it worth it to deplete depth for him or not?

QB Mitch trubisky and rivers
RB M Gordon, Nick Chubb, Marlon Mack, K Johnson, Matt Breida
WR S Diggs, J Gordon, Doug Baldwin, Keke Q
TE Burton

Thoughts?