Injuries, speed concerns for top TEs

The tight end class comes to the 2010 combine with a lot of questions to answer.

Oklahoma's Jermaine Gresham and Arizona's Rob Gronkowski top our rankings, although neither played a down in 2009 because of injury. Gresham is coming off a knee injury, and scouts want to know whether he has the same athleticism and fluidity that made him a seam-stretcher in the passing game. Gronkowski must prove he has not lost his top-end speed. Both will have to prove they can shake off the rust and return to form to maintain their first- and second-round grades, respectively.