Pick up Gronkowski?

[LawTiger30]

I'm 9-1 and trying to strengthen my roster for the stretch run and playoffs. Rob Gronkowski was, surprisingly, unclaimed on waivers and is available at the moment.

So I am contemplating whether I should stick with Witten and Cooley, or if I should drop Cooley (probably not going to drop Witten) or someone else for Gronkowski.

My roster is below. I'll help you too. Thanks.

Current Roster:
A Rodgers
R Rice
R Mendenhall
A Boldin
C Johnson
J Maclin
J Witten
N Rackers
Saints
E Manning
L Blount
B. Green-Ellis
M. Moore
B. Wells
M. Williams
P. Garcon
C Cooley