Looking back on three things discussed here before the San Francisco 49ers closed their 2013 preseason schedule with a 41-6 road victory over the San Diego Chargers on Thursday night:1. Final QB impressions: Starter Colin Kaepernick, backup Colt McCoy and third quarterback B.J. Daniels combined for four touchdown passes without an interception. The group made a positive final impression overall, even though McCoy averaged just 3.7 yards per pass attempt while completing 8 of 15 attempts for 56 yards.