The best information a fantasy player can have is knwoing which defenses are the worst against the run. He can use the information to make an informed decision which RB to start, and this information can be used to determine the start/sit decision for QBs and WRs. If a team can effectively rush the ball, the need to pass is minimized.
For the New York Jets, the decision to start RB Thomas Jones against a Kansaa City Chiefs' rush defense that has allowed more than 200 yards on the ground over the past three games is easy. As a matter of fact, the Chiefs have allowed more than 300 yards rushing twice in its six games.
The harder decision is what to do with QB Brett Favre and his pair of WR threats, Laverneus Coles and Jerricho Cotchery. Both receivers are dealing with injuries and listed on the injury report. Given the likely effectiveness of the Jets ground game, sitting either for a wide receiver of similar value would be justifiable.