The 49ers' passing game-led by athletic QB Colin Kaepernick and blazing-fast former Terps tight end Vernon Davis-haunts the dreams of NFL defensive coordinators. Davis, who at 6 feet, 3 inches and 250 pounds runs a 4.38 40-yard dash, is too fast for a linebacker to cover and too big for corners to handle. If he gets into single coverage with Lewis or Dannell Ellerbe, he will make huge plays. Normally a fierce pass rush could help limit the big plays, and late blooming linebacker Paul Kruger and 2011 Defensive Player of the Year Terrell Suggs have shown they're up to the task, but Kaepernick provides a unique set of challenges. In addition to his laser arm, which might be a match for the mighty gun of Joe Flacco, the 6-foot-4-inch giant runs like a gazelle riding a deer. In the conference round, Kaepernick ran for 181 yards, a record for quarterbacks, against the Packers.