Beating the Raiders doesn't prove much. I could pull 10 guys off the bus and beat the Raiders. Raiders beat San Diego the week before. Remember that Denver and KC have played similar schedules thus far.
Oakland does have some talent and some All-Pro players. They haven't had a great record for years but they are competitive, and Terelle Pryor can be dangerous. The game was a slugfest until the 4th qtr when KC pulled away