biggest MYTHS that football fans believe in is that a player ( particularly an older player ) will automatically be just as good ( if not better ), the following season, as he was the previous season. It doesn't necessarily work with players in their prime, much less players in the twilight of their careers.
FLO didn't have a " great " year in '09. He didn't even have a " good " year. He had an " average" season for a LT, which is a big drop off from his prime years. He's going to be 35 years old in a couple of months, and unlike wine, football players don't get better with age at this stage of their careers ( few exception noted ).
Is he able to play one more year ? Possibly, but it won't be at the same level that he played this past season, which, in turn, was not at the same level he played the year before. What he's going to do, if brought back, is push back Free's playing time and development. Unless injuries dicates otherwise, Free will be the starting LT for this team at some point in the future. He was being groomed to take over that position until the team was forced to start him at RT because of Columbo's injury. Which point on that future, is the decision the team needs to make, and imo, the sooner they make the change, the better they're going to be in the long term.
Free may not ever be as good as FLO was at the prime of his career ( very few OTs that ever wore the Cowboys uniform were ), but right now, today, he can offer something that FLO cannot: youth and health.