Miami Dolphins have added a fifth quarterback to the training camp roster, and it is a player already familiar to the team. The Dolphins have re-signed quarterback Brock Jensen, a former North Dakota State standout who Miami signed as an undrafted rookie in May, and cut last week. The Dolphins cut Jensen to sign Seth Lobato, a 6-foot-6, 223 pound rookie from Northern Colorado who has a stronger arm. But Matt Moore's shoulder injury, which has kept him sidelined for the past two practices, creates a need for a fifth arm, especially considering Ryan Tannehill isn't expected to play much in Friday night's exhibition opener against the Atlanta Falcons.