Elvis Dumervil worth picking up from waivers?

Redraft league and we start 2 LB

I currently have
S.Lee
N Barnett
Daryl Washington
D Hawthorne

Dumervil coming back from injury worth a roster spot over any on my roster?

If Dumervil could have upside towards the end of the season, I could consider dropping one of my offensive bench players as well.

I would have considered dropping Hawthorne before last week, but since he had a good week 3 i would probably just stay put. I don't know your league set up but If your scoring isn't super tackle or sack heavy i've found it isn't worth dropping offensive guys for IDPs. it all depends on your league set-up.