SEATTLE -- The fact that Seattle Seahawks receiver Percy Harvin will miss the NFC Championship Game Sunday could be a game shifter, ESPN analyst Matt Williamson said.It could be a big reason why the San Francisco 49ers pull an upset, Williamson said."I think it is giant," Williamson said. "It will certainly be a close game and being at home is huge for Seattle, but Seattle not having Harvin is that important."The Seattle offense has not been playing at a high level and Harvin would have given it a speed dynamic it is missing, and the San Francisco defense would have had to account for it, Williamson said.