Need Week 7 and Beyond Help Please

So I'm in a deep 14 team league with large IDP roster spots. We start the following:
0-4 DE
1-5 DT
3-5 LB
1-5 CB
0-4 S

So at minimum we can start 5 IDPs, but we usually have to start 9. I am short on LBs and need to scour some guys off the FA who can help for the remainder of the season.

Here's my squad:
LB: C Lofton, B Cushing, M Lawson, D Hawthorne
DT: T Brown
DE: A Brown
CB: L Hall, R Marshall, P Robinson, D Rogers-Cromartie
S: E Weddle, A Bethea, CC Brown, W Moore

So you can see that I'm heavy in my defensive backs, but really thin in LB. Here's the top guys on the FA:
M Roth, T Spikes, M Haggan, J Hunter, L Grant, K Misi, etc..
Then there's some names which jump out:
M Petersen, J Porter, N Barnett, P Angerer

Need help for some LBs for the rest of the season. Thanks and great work as always!

None of those linebackers are great options this year. Spikes is probably the best. Long term Angerer would be a very nice pickup. Barnett should come back strong next year as well. Peterson may be a decent play against the Bengals this week with Weatherspoon out.