If he can't run because of breathing issues, no, sit him down.
The issue with the NFL is no team discloses accurate information on injuries so we don't know if its bruised ribs, broken ribs, fractured ribs, removed ribs, amputated ribs, etc ...
If we activate Nelson, who do we sit? I think you still need to activate all WR's because if you don't activate Trevor Davis and Nelson gets one hit and is out, you are then short handed.
I would like some gamemanship to be played. Have Jordy participate full in practice so the Falcons have to prepare for him and then sit him for the game. Yeah, I'm a dirty asshole, so what? WE GOING FOR THE SUPER BOWL!!!!