Mayock: The Ravens have to be looking for a wide receiver. He fits what they should be looking for, a vertical threat who could help Mark Clayton, Demetrius Williams and Derrick Mason. [ Joe] Flacco has a huge arm. The only question [about Heyward-Bey] is, is he a natural catcher of the football? He makes a great catch one play, then double catches on an easy play. If I'm expending a first-round pick on a wide receiver, the most important qualifications at that position are great hands.What's the difference between quarterbacks Matt Stafford, Mark Sanchez and Josh Freeman?