He's a really interesting case. I loved the guy as a prospect. He was my first real draft binky. He had a good rookie year in a situational role, missed his entire second season, was really good two years ago with 11.5 sacks, and then regressed terribly last year.
I think he would have been a much better fit a few years ago when the Pats were playing the 3-4, where they could better use his versatility and athleticism in coverage. In the 4-3, I don't think he's an ideal fit at DE because he didn't have success rushing the passer last year.
I'd almost be interested in trying him out at 4-3 OLB. The athleticism is definitely there. The guy ran 4.47 at 256 pounds and has the fluidity to match that.
So here's my super crazy plan that could maybe work: Trade Spikes, move Hightower inside, sign Barwin, play him at Sam.
Other than that, probably not happening.