I don't have a problem with Tiki going over Westbrook. It isn't a career award, but in this case, IMO the career can be a tie-breaker, and Tiki is having a good season. The #4 rusher, although he doesn't get many TDs as he's replaced by Jacobs. We knew he would get the nod this year, and I don't think you can say, irrefutably, that Westbrook is having the better year all things considered.
Maybe you can, but I don't see it.
Brian Westbrook: 213 carries for 1092 yards (5.1 avg), 74 receptions for 664 yards (9.0 avg), 11 TDs in 13 gamesTiki Barber: 288 carries for 1357 yards (4.7 avg), 52 receptions for 429 yards (8.3 avg), 2 TDs in 14 games
Westbrook: 1756 yards from scrimmage and 11 TDs (in 13 games)
Barber: 1786 yards from scrimmage and 2 TDs (in 14 games)
Westbrook has better averages across the board, but the TD difference is what separates them and it's a huge difference.