Statistically, Docket has been arguably better than Harris. During his four-year career, Dockett has racked up 180 tackles, 15 sacks, and three interceptions. Over the course of Harris' four-year tenure in Chicago, he's totaled 141 tackles, 19.5 sacks, and zero interceptions. Furthermore, Dockett has been more durable than Harris. Dockett has played in every game throughout his NFL career while Harris missed four games in 2006 due to a hamstring injury.
Dockett's performance and stat line is even more impressive considering the lackluster defenses he's been a part of in Arizona. Although he's now surrounded by playmakers such as LB Karlos Dansby and SS Adrian Wilson, he wasn't as fortunate earlier in his career. Meanwhile, Harris has benefited from a superior supporting cast, in particular Pro Bowl LB Brian Urlacher.
DT Tommie Harris
Further complicating matters for the Cardinals is the current status of WR Anquan Boldin. Boldin is also represented by agent Drew Rosenhaus and is looking for a new contract. Boldin will likely demand a similar deal as WR Larry Fitzgerald. Additionally, Wilson's contract is nearing its expiration and fresh negotiations with the Pro Bowl safety will be heating up soon.
Dockett will once again be heavily relied upon in a Cardinals defense poised to turn the corner this season. Although he signed a five-year extension in 2006, Dockett is unlikely to back off from his recent contract demands. His current skill-set and upside make Dockett one of the best defensive tackles in the NFL and equally as valuable as the three-time Pro Bowler Harris.