LB help

Scoring is tackle 1, asst .5, sack 3, int 3, ffumble 1, recovery 1, def td 6, safety 5 pass def 1, block kick 2. We start two DB and two flex D- most people use LB's.  I picked up McCarthy in our draft. I also have Sean Lee. (Mikell and Berry are my dbs)  Should I drop McCarthy? If so who would you suggest?   Some on the wire include Donald Butler, David Harris, Rolando McClain, DJ Smith, Von Miller, and Lamar Woodley.  I dont think anyone would grab McCarthy if I dropped him but not sure.  I always check your rankings first. I don't like to add and drop too much but am willing on occasion.  Who is the best bet for rest of season with Lee?  Thanks for all the advice.  Very helpful.

I loved Donald Butler coming into the season and I love him even more after watching tonight's game. I still like McCarthy but Butler has just as good of upside without the injury concern. I would make the move for Butler.