Looking back on three things discussed here before the San Francisco 49ers' third exhibition game of the 2013 preseason, a 34-14 home victory against the Minnesota Vikings on Sunday night:1. Seneca's debut. Coach Jim Harbaugh indicated all five quarterbacks would play in this game. Plans change. Colin Kaepernick, Colt McCoy and rookie B.J. Daniels were the only quarterbacks to play meaningful snaps. Scott Tolzien reportedly had back spasms. He did not play.