As a leader I expect him not to throw Qb's under the bus and openly campaign for one player over another, especially through the media like he did for Losman over the likes of several other QB's. Evans liked Losman because he knew he'd get those long passes several times per game, even if it hurt the rest of our offense.
As far as running routes. He is probably the worst route runner I've seen. He never goes across the middle and I've seen him time and again pull up and let a ball get intercepted if he has to take on a safety going for the ball. he avoids all contact. Watch him sometime and go to a game. Last game I went to the folks I was with watched every route he ran. he never crossed over the hash marks on any route for the entire game. Whether that is him or coaching, who can say for sure. But I would expect as much pressure as our Qb's have been under that he would at times have to cross a hash mark to adjust a route to help a QB out. Not once. Watching on TV it is also pretty obvious he is a one route pony.
So as good as those pretty long passes are they are rare (under 8 per year). Add to that his obvious poor attitude and off field chattering, he is not a team player.