Cowboys tight end Jason Witten has reportedly offered to sign a waiver that would allow him to play in Dallas' season opener at the Giants on Wednesday, weeks after he sustained a lacerated spleen. But according to sources, Dallas won't let Witten on the field without medical clearance, waiver or no waiver. A ruptured spleen is a potentially life-threatening injury -- just ask Chris Simms, who had his removed in postgame emergency surgery in 2006. Are the Cowboys being prudent in holding Witten out of the game? Or should he be allowed to play if he feels ready and is willing to assume the risk?