I think Trent Edwards has a form of Chuck Knoblauch syndrome, sometimes referred to as "the Yips" - "Steve Sax disease" - and "Steve Blass disease". I'm not being facetious, hence the fan post title "In all seriousness".
The definition of this disease or syndrome is: the apparent loss of certain fine motor skills seemingly without explanation in one of a number of different sports. Sometimes they recover their ability, sometimes they compensate by changing technique, or may be forced to abandon their sport at the highest level.
After doing a bit of research there have been many athletes in all different kind of sports that have been effected by this syndrome, and at the highest levels.
I liken it to "stage fright". Someone that can sing in the shower, but can't get in front of an audience. Even if the audience is a karaoke bar and the person has the words right in front of them and has sang that song a million times in their head.
To me there's a distinction between Edwards and a QB that can't play. That distinction is that we have seen him play well. We saw it in the early games of 2008 and in pre season. So we know the ability is there. Then after several hard hits and concussions the guy just lost all ability? I don't believe that. I think he's got a mental block. Heck even the national media is baffled at why he won't throw the ball. It has to puzzling Gailey as well. He saw the guy flat out win the job with an admitted open competition. Then he goes out with real bullets flying and performs like that. I truly believe it is pure stage fright and a "loss of certain fine motor skills seemingly without explanation."