by Michael David SmithFiled under: RedskinsTo veteran NFL players, the preseason is a necessary evil, a four-game stretch in which they get paid peanuts (relatively speaking) and just hope they don't get hurt. But to young players trying to prove themselves, the preseason can represent a major opportunity. And Redskins backup quarterback Colt Brennan says he's going to make the most of that opportunity.Colt Brennan Plans to Prove in the Preseason That He's a Starting QB originally...