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Which way does the thumb turn for the 49ers after their 35-3 rout of San Diego in Thursday's preseason finale, including Delanie Walker's spinning TD lunge, Colin Kaepernick's best passing performance, a mauling O-line, a two-way Tukuafu, second-unit safeties collaborating, nasty backup middle backers, A.J. Jenkins' steady emergence, the race for QB No. 3 tightening and much more? Check inside.