Dolphins RCB Richard Marshall has "moved past" his 2012 back problems and is fully expected to open the season as a starter. Marshall and LCB Brent Grimes are markered in as Miami's Week 1 bookend corners. Rookies Jamar Taylor and Will Davis, along with veteran Dimitri Patterson, will push Nolan Carroll at nickel back. Marshall had back surgery last November to repair two ruptured disks. When healthy, he's a versatile if inconsistent cover man capable of covering the slot and playing some safety.