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Point spreads and divine intervention won't affect the outcome of Super Bowl XLVII, but there are several other factors that could play an important role when the Ravens and 49ers meet at the Louisiana Superdome. Niners quarterback Colin Kaepernick has a major-league fastball and shocking accuracy. Ravens quarterback Joe Flacco throws arguably the best deep ball in the NFL. But neither team will win without getting it done on the ground.San Francisco's offensive line is widely considered the top run-blocking unit in the NFL, and the 49ers averaged 37 more rushing yards (155.7) per game in the regular season than the Ravens. In the postseason, the Niners have been even better, rushing for 472 yards in two games. Kaepernick ran for a record-setting 181 vs. the Green Bay Packers, and the late-season emergence of rookie LaMichael James gives San Francisco two dangerous options behind bell cow Frank Gore.