T.J. Watt is the best defender in football, and if you disagree, you had better come with a damn strong argument for somebody else. While his numbers alone will tell you that few can compare with him right now, the tape is even more compelling.
And that tape includes the sorts of things opposing offenses feel that they must resort to in order to try to contain him, or slow him down, yet it has rarely been overly effective. He has recorded at least one sack in all but two games played so far this year, with 16 in total, coming off of a career-best 3.