7) Vance McDonald, TE, San Francisco 49ers: McDonald was drafted to fill the void created by Delanie Walker's departure in the offseason. However, after the unfortunate injury to Michael Crabtree, McDonald's role could be much larger in the upcoming season. Vernon Davis has spent time practicing as a wide receiver to help offset the loss of Crabtree; this could lead to more snaps for McDonald. His college production wasn't eye-popping (36 catches and two touchdowns in 2012), but the rookie's physical tools are tough to ignore. He has the size (6-foot-4, 267 pounds) and explosiveness (4.69 40 time) to develop into a complete tight end. This is a case of talent meeting opportunity and it could result in surprising rookie production from this second-rounder.