Sometimes, the X-factor is the obvious one. The Eagles have big-time weapons all over the field, including Michael Vick, LeSean McCoy and Jeremy Maclin. But just ask the Giants ... or ask anyone who has held their breath whenever the ball winds up in Jackson's hands. He's a bolt of lightning. Sure, he can hurt his own team with celebration antics or other bad moments, but that's all part of the "X-factor." You won't know exactly how he will affect the game, or if it will be in a good way or a bad way. But Jackson definitely will have an impact.