Is it time to drop Colin McCarthy?

It's a 12 team dynasty league and we start 3 LB's.  I've already lost Carter and Bishop to season ending injuries, so I'm not sure I can keep a nonproductive LB on my roster.  My other LB's are Lofton, Mayo, Foster, and I just picked up Thomas Davis.  Miles Burris and Jameel McClain are sitting on the waiver wire...I know that McCarthy is the best dynasty option, but I may need to upgrade my LB3 for the playoffs.

What do you think?  Drop McCarthy?  If so, for which LB...Burris or McClain?

Scoring:  2 pts per tackle, 1 pt per assist, 6 pts per int, 2 pts per TFL, 3 pts per sack, 1 pt per forced fumble, 2 pts per fumble recovery, 1 pts per pass defensed, & 6 pts per TD.

I like Davis over the available WW options. With this said, I'd hold onto McCarthy if possible since this is a dynasty league. However, if you feel the need to drop him, I'd pick up Burris.