Don't we usually hear about teams being interested in players that hit the market? I don't recall any stories indicating Hardy was being courted by anyone else. I do recall when Peyton hit the market San Francisco, Denver and even Philadelphia were in play.
But we didn't hear anything about Hardy other than Dallas. Unless, of course, you know of some other team who was after him.
You have gone from saying he didn't have offers to saying you didn't read of any. First, Hardy was in Dallas negotiating on the second day of FA, there wasn't a ton of time.
Second, the vast majority of media stories about teams being interested are leaks from agents and not a reflection of the market. You didn't read about Philly being interested in DeMarco until the last moment, which was months into the FA period.
Third, every team with a QB opening would have every incentive to talk to the press about pursuing Payton Manning. With the legal issues around Hardy, a team would have no incentive to have it out in the media they were pursuing a controversial player.
My point (still) is that we don't know whether teams were pursuing him or not.