Should I trade Mendenhall for Andre Johnson with Schaub out?

[msb006]

I'm in a 10 team PPR league, i'm debating trading mendenhall for andre johnson even with schaub out. I have lynch as my 3rd RB currently on the bench, who has been out performing mendenhall. Will Lynch continue to beast? Here is my current roster:

QB: Stafford

WR: Brandon Lloyd
WR: Julio Jones
WR: Mario Manningham

RB: Lesean Mccoy
RB: Michael Turner
W/R: Rashard Mendenhall

BN: Marshawn Lynch
BN: Jackie Battle
BN: Mike Williams
BN: Harry Douglas
BN: Lance Ball