It's just a combination of forces that causes a tear. His "surrounding muscles" were fine. If not, he'd of had problems before now. Just bad luck, but injuries happen to all teams every year. Every change creates opportunity. Let's hope JRob has staffed personnel with a gem in the rough and Vrabel and co. can coach 'em up. I believe we have such a strong group of LB's (and interior DL) a slightly above average rusher is going to look great.