Getty (Photo by David Becker/Getty Images) The Las Vegas Raiders appear to be adopting the old-school approach of letting the young quarterback sit and learn from the veteran. With rookie signal-callers coming into the NFL and tossing them into the fire right out of the gate, the Silver and Black might not want to do that. As a result, it’s why Las Vegas chose to sign Kirk Cousins, who can start and help No. 1 overall pick Fernando Mendoza in the process. Whenever it’s time for Mendoza to take