I wouldn't be surprised if team morale goes down the crapper when he steps into the team camp.
How do you figure? It's not like Dallas has been a superbowl regular the last few years.
Parcells is very unhappy with the progression of the team as it is and if anyone chooses to sulk then they will find themselves cut. I am sure that Jones feels the same way.
Winning is the ultimate morale booster. If Dallas even fields a half way decent QB, they will be able to march up and down the field with regularity. This is also do wonders for their running game.