I'd play with a lot of heart, as well, but I'm afraid that just doesn't cut it. He had 3.5 sacks while playing all 16 games and ranked as the 59th edge rusher in the entire league according to PFF. That's still slightly above average, but not by a lot.
I guess you could get him back if he somehow would agree to playing 2nd/3rd string on a 1-year deal totalling less than $ 4 million. I mean, I think Smith and Smith would get the most snaps, with Fackrell just behind. I just don't see him play in that roll.
There'll be a team desperate for edge rushers who'll give him a lot more than he's currently worth, based on his former production and name.