Cowboys linebacker Zach Thomas is eager to put his history of concussions behind him, according to The Associated Press. "They labeled me with that, as prone for concussions," Thomas said. "Everybody just thinks I'm some guy out here that's punch drunk, running around." Concussions and migraines limited the seven-time Pro Bowl linebacker to five games last season. "I wouldn't be here if it was going to be a problem," Thomas said. "Trust me, there's no difference between 12 and 13 years to me. I could have retired and did all that."