The Las Vegas Raiders quarterback battle hasn’t even begun to heat up yet, but there’s one player in the group who isn’t getting talked about enough. Everybody expects No. 1 pick Fernando Mendoza and Kirk Cousins to duke it out.However, Aidan O’Connell has been slept on in the process. If the Raiders thought he could be a long-term starter, they wouldn’t have drafted Mendoza and signed Cousins, but he’s been solid when asked to start in the pass…