Eh, Shanny has his daddy's talent for turning poop into gold at running back (Terrell Davis, Olandis Gary, and Mike Anderson were all day 2 picks, and would have been day 3 picks in the modern format). Also, the Jets had the #25 rush defense last year, and didn't do much to address it. Not denying it was a good night for him or that he won't be serviceable, I just think Mason wouldn't have neccesarily had that success with another team.
Also, all that makes it more amazing that he abandons the run late and keeps blowing leads in big games.