You may be right:
League's 2015 injury report policy states: "All players with significant or noteworthy injuries must be listed on the report, even if the player takes all the reps in practice, and even if the team is certain that he will play in the upcoming game. This is especially true of key players and those players whose injuries have been covered extensively by the media."
"Significant or noteworthy" leaves some room to play with. The problem is, nearly everyone is injured or bruised in one way or another especially late in the season. It's seems like a normal (unwritten) code to only list a player if he's limited in practice, and then list him as full participant if he gets healthier. I looked over Packers' injury reports, and there were less than a handful instances where a player entered the injury report as a full participant.
I think we can get away with this one.