According to Reiss:
Marcus Cannon signed in time for Friday afternoon's practiced and joined the group of players doing strength and conditioning work on the sidelines. Joining him were tight end Aaron Hernandez, defensive linemen Ron Brace and Brandon Deaderick (all active/PUP), as well as offensive lineman Mike Berry and safety James Sanders (active/NFI). Not spotted was defensive lineman Myron Pryor (active/PUP).
I would think all of these are candidates for not passing the conditioning test. Of course Ron brace's name stands out. I am of the opinion that the conditioning test is just a very difficult one for Ron to pass even if he is in good football shape.