I agree the revenge game will be played down by Kirk, but he was treated like crap there. Basically the coaches and front office blamed him for the team's problems of not finding success. I remember Gruden bragging how his team upgraded the QB position after Kirk left and they signed an aging, injured Alex Smith as his replacement.
I wouldn't doubt somewhere hidden deep inside Kirk he has the same emotions that PP didn't hide last week against AZ. Personally I do believe Kirk will have a little extra motivation to play well and show Washington what they lost. I'm not expecting something as exciting as the '09 Favre revenge games against the Packers, but maybe a little more fire and emotion to win this one than usual.