Just throwing this out there.
Sources have told WalterFootball.com that Cousins' football IQ is tremendous. Having him in the meeting room helped Griffin to develop, and the two quarterbacks worked extremely well together. With Griffin coming off a knee injury, Cousins should see a lot of good developmental snaps with the starters during the spring OTAs and mini-camps.
Even though there are plenty of teams that could be interested in trading for Cousins, sources have told WalterFootball.com that the Redskins have zero interest in dealing him. Allen will assuredly listen to what another team would offer him, but Washington will not be shopping Cousins. He could be a needed fill-in for the Redskins in 2013 and they love having a reliable backup like Cousins.
Thus, the 2014 or 2015 offseason would be the time to shop Cousins. If he gets on the field and performs well, obviously he will drive up the price tag and Washington could hope to regain some of the first-round picks the team used to land Griffin.
Around the time that the Redskins would presumably be willing to trade would be when Schaub's guaranteed money could be covered.