Beyond the obvious ramifications of Sunday's matchup between the San Francisco 49ers and Seattle Seahawks -- Seattle can clinch the NFC West with a victory and San Francisco needs to win to keep hold of its wild card spot -- both teams will likely have their No. 1 receivers back. What difference will that make to their offenses? We tapped ESPN NFL Insider Matt Williamson to break down what Michael Crabtree and Percy Harvin bring to their respective teams.
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