If Landry is willing to take a short term incentive laden contract to prove he's healthy and capable of being the player he looked to be during his injury shortened 2010 season, then I'm all for re-signing him. If he's looking for big money, look else where as he just hasn't proven to be worth it yet.
As for his mass, I'm concerned he'll end up with David Boston type issues long term. That said, just because he's freaking huge doesn't mean he's juicing. These guys have all the time and money to workout in a way the vast majority of people can't. That doesn't mean I would have any issues with him having to be tested prior to signing and throughout his contract.