Newcomers will challenge veterans on both offense and defense
Trainer for third-year pro says Raiders running back has more "explosiveness"
To many NFL scouts, coaches and executives, Derek Carr is indeed a quarterback worth building around.
Former 49ers wide receiver hasn't posted a big season since injury with San Francisco
McGloin could earn No. 2 spot -- or a trade to another team -- with an excellent training camp and solid performances in exhibition games
Carr says Cooper's ability to get separation from defenders while running routes is "ridiculous"