Why Darrin Walls Is the New York Jets' Biggest X-Factor in 2014

The New York Jets have improved significantly in many areas over the past year.  At quarterback, Geno Smith looks more mature and refined from a season ago, and Michael Vick gives the team one of the league's best running backs.  At running back and wide receiver, free-agent additions Chris Johnson and Eric Decker should pay dividends and give Smith some more dangerous weapons.  The defensive line and linebacker corps, both solid to extraordinary in 2013, should also be better with more exper...