Former Auburn quarterback and likely first-round draft pick Cam Newton worked out for the media at a San Diego-area high school Thursday.  While the Heisman Trophy winner got some positive reviews as he tries to tailor his game from the Tigers' spread offense to a pro scheme that requires taking direct snaps from the center -- similar to what Broncos first-rounder Tim Tebow went through a year ago -- NFL Network chief draft analyst Mike Mayock offered words of caution.  "I've watched five of his game tapes, he's got a classic over-hand delivery, he's got a big arm," Mayock said on Thursday's NFL Total Access.  "His mechanics are very good, but I would also (offer) one cautionary note, and that is the best pro day for a quarterback I ever attended was JaMarcus Russell. That same day, even though I admitted it was the best pro day I ever saw, I also said I wouldn't take him in the first round. For me, it's not about him throwing in shorts; it's about a lot of other things."  Russell was selected No. 1 overall by the Raiders in 2007 but was jettisoned after just three disappointing seasons.  Newton has been receiving tutelage from quarterbacks coach George Whitfield Jr. (who helped Steelers QB Ben Roethlisberger during his four-game suspension to start the 2010 season) and Hall of Famer Warren Moon for the past month.  "The supporting cast that I have is pushing me to be great, I'm pushing myself to be great, and I demand greatness for myself. So coming in the door, working out every single day, I'm shooting for greatness," Newton said.  Said Moon: "Every day he does something a little bit better than he did the day before, whether it's taking the snap from center or whether it's transferring his weight from dropping back to throwing the football. That's where he's making his biggest adjustment, to me, is being able to drop back, because that's something he's never had to do."  ESPN analyst and former NFL quarterback Trent Dilfer, who focuses on breaking down college quarterbacks predraft, came away impressed.  "He is a special talent," Dilfer said. "He's uniquely gifted. To be this much of a puppy, I mean, he hasn't played a lot of true quarterback in his life; to be this refined mechanically, you don't see this very often."  Mayock, for one, continues to reserve judgment.  "To me, there are two issues with this kid," he said. "Issue number one is he came out of a shotgun, and if you watch the tape it's basically a very simple offense. One read and either the ball was out or he was out. Can he adapt to, can he process and assimilate a very structured and complex pro offense against a complex pro defense?  "And secondly, and most importantly, when you get to a certain skill level in the NFL, which this kid certainly has, at the quarterback position what kind of kid is he? Is he going to be the first guy in the building? Is he a gym rat? Is he football smart? Is he a leader of men? All of those things to me are way more important than any workout in shorts."  See photos of: NFL, Tim Tebow, JaMarcus Russell, Cam Newton
NFLN's Mayock cites 'cautionary' Russell tale after Newton's workout - The Huddle: Football News from the NFL - USATODAY.com