I think guys would be able to choose whether to participate or not. For some, it could be beneficial. Coming off injury, UDFA, late season cuts... this would be a perfect way for Adrian Peterson and Ray Rice to prove they still have the physical skills. It very well could work against certain players, I understand that, but giving guys an open opportunity to get in front of the eyes of teams sounds like a good idea. A lot of players go by the wayside because teams might not see their talent or don't have enough time to properly evaluate them one by one by one by inviting them to work out.... i dunno, just a thought.