A battle of 3-2 NFC West teams is on hand as the San Francisco 49ers welcome the Arizona Cardinals on Sunday. ESPN.com's Cardinals reporter Josh Weinfuss and 49ers reporter Bill Williamson discuss the key division game:Weinfuss: Has Colin Kaepernick hit any form of a sophomore slump?Williamson: I can see why you'd think that -- his numbers are down. However, he is not playing terribly. The big issue is the 49ers really miss injured receivers Michael Crabtree and Mario Manningham.