Linebacker Zach Thomas' history of concussions doesn't seem to have caught up with him yet. Thomas, 34, will sit out the Dolphins' road game Sunday against the New York Jets because of a concussion he suffered in the Dolphins' loss to Dallas six days ago. But medical tests didn't raise red flags for a player who has suffered multiple concussions and once considered retirement because of the problem. "It's good news," coach Cam Cameron said Friday. "They brought back the MRI, and they didn't see anything on that." Cameron said the playing status of Thomas, who missed the past three practices, will be day-to-day after Sunday.