First time FFL player need trade advice

Currently 1-3 in a 12 man 1 point PPR league and got the following trade offer from a guy who is 1-2-1.

I give up Lacy & Cindy D for Brandon Marshal, Larry Donnell & Lions D

My team:
R. Wilson
T. Brady
E. Lacy
Z. Stacy
J. Bell
V. Davis
M. Ingram
G. Tate
D. Jackson
E. Royal
L. Fitzgerald
H. Douglas
C. Shorts
Bengals D
Steelers D (picked up for this week bc of cincy bye)
J. Tucker

His team:
P. Rivers
L. McCoy
P. Thomas
J. Hill
B. Marshall
J. Edelman
P. Garcons
B. Hartline
J. Gordon
L. Donnell
J. Thomas
Lions D
Saints D
S. Suisham

Any comments appreciated. Need to do something with my line up, but not sure if I want to give up on lacy, especially with him having McCoy.