I don't know that he broke his promise to Jerry.
Cowboy Nation is down on T.O. now... but in 2006 and 2007, Owens was a HUGE positive for our football team.
Not even Dallas fans who hated T.O. could deny that.
In 2008, it appears clear that T.O.'s negative attitude DID contribute to our poor season. But it wasn't as big a contribution as Tony Romo's injury. Or as big as Felx Jones' injury. Or as big as Roy Williams' inability to contribute. Etc.
I'd say all-in-all, Jerry got a pretty nice overall three years from Terrell Owens. It didn't work out as well as we all hoped it would. But overall, I think T.O.'s positives as a Dallas Cowboy DO outweigh his negatives, over the course of his three year tenure.