Lost in the hype surrounding the Arizona Cardinals' cornerback pairing of Patrick Peterson and Antonio Cromartie are question marks at safety. Free safety/nickelback Tyrann Mathieu is ahead of schedule in his rehab from reconstructive knee surgery, but he remains without a timetable for his return. There also are questions surrounding free-agent strong safety Yeremiah Bell, a 16-game starter and every-down player in 2013. The Cardinals have offered Bell a one-year contract, but the 36-year-old is mulling retirement, according to KGME-AM's Mike Jurecki and ESPN.com's Josh Weinfuss.