"There is no shame in spending time as a prince learning the role of the king before you take his seat," Fahey concluded. "For most, it is a necessary step. Peterson is an exceptional talent and athlete, but he is no exception when it comes to developing as a pro. He must refine his talent, but once he does he may have no equal."
Unlike Sherman, Peterson often tracked the opponent's best wide receiver all over the field, play after play. That made Peterson's job tougher than Sherman's job, a key distinction when evaluating the best cornerbacks. Darrelle Revis, widely regarded as the NFL's top corner before suffering a knee injury last season, has set the standard recently for eliminating opponents' top wideouts.
"Peterson can be a Hall of Fame corner," Williamson said. "In a league full of superb athletes, he is in the top 1 percent. He is not yet half the technician of Revis, but he is learning and his upside is higher than the upside for any corner in the league."
Peterson's relative difficulties against slot-type receivers might not be a problem to the same extent in the future. One, Peterson will most likely continue to improve. Two, Arizona added slot corners Javier Arenas and Tyrann Mathieu to match up with some of those smaller, shiftier wideouts.
"Slot corner is really its own position," Williamson said. "A slot receiver like Wes Welker has a two-way go and there's no sideline as the helper for the corner. I could see Peterson being a bit of a fish out of water against some of those guys."
Cardinals receiver Larry Fitzgerald said last offseason he thought Peterson was quickly on his way to becoming the best cornerback around.
"From a physical standpoint, he has no weaknesses at all," Fitzgerald said. "Most guys you go against, bigger guys, I can manipulate them on the field or physically. Patrick is just so different. He has the game-changing speed. He can run with anybody in the league. His ball skills are like playing with another receiver. He can tackle you in the run game. He knows what’s going on, is a student of the game.
"You want to draft a guy to carry the torch for your team, Patrick Peterson epitomizes that. Just his maturity. He’s 22 years old [now 23]. He just got married. His outlook on life, the way he carries himself, the way he performs, it’s like a 30-year old. He just gets it. To get it at that young of age, that is a scary combination when you couple that with elite talent."