He did, for the most part, do nothing. He was a body. His sacks came on plays when the pocket collapsed from the other side and the quarterback drifted his way. Most people would have gotten those. He never "generated pressure" by beating his man or anything of that nature. The expectations set were him were fairly modest. Nobody thought he would have the 16 sack season he had in Oakland, but he wasn't even useful at times. Inconsistent, and team ran it RIGHT at him last year and he did nothing about it. Hurt this team way more than he helped it.
R.I.P. Junior Seau