Apparently, he was not endearing himself to the most important person on team - the head coach.
http://www.azcentral.com/sports/cardinals/articles/2008/11/19/20081119spt-bickley.html
Thats a fantastic write up on it.
I also wonder why we never heard of him being missing/unexcused for the only bye week practice. That is unacceptable. I notice nashman doesnt comment on thing like that. He probably thinks because its Edge that its ok.