CMC for 2 RBs?

Trying to flip CMC for 2 RBs from someone who’s deep at RB, as after CMC I have zero depth at that position. Was thinking of trading CMC, Thielen, Fant and Hubbard for Cook, Mixon or Mitchell, OBJ and Mattison. Would including Mixon be too lopsided? Would switching him out for Mitchell be too lopsided in the other direction? I get depth at RB, he gets CMC plus upgrades in pass catchers. League is full PPR. Thanks!