You mean, other than the strength, stability, flexibility, and contours of Carson Wentz's left knee? OK, I'll bite. Jim Schwartz's entire defensive philosophy is predicated on toughness, intimidation, and aggressiveness. Our guy beats their guy in a one-on-one matchup, and our guy sacks the quarterback or gobbles up the running back or blankets the wide receiver or delivers a bone-rattling hit. But if the preseason has been any indication, the Eagles will have a difficult time adjusting to the NFL's new guidelines for helmet-to-helmet contact.
Their first-team defense committed several personal-foul penalties because players, such as safety Rodney McLeod and linebacker Nigel Bradham, lowered their heads as they tackled opponents.