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Anthony McCoy's injury and offensive shift

Fifth-round tight end Luke Willson was one of the more impressive players in rookie camp with the Seattle Seahawks recently.

It's looking like the team will need him.

2012 Seahawks TE Use, 1st/2nd Downs

Anthony McCoy, who started five games and played 45.5 percent of the offensive snaps in 2012 as the second tight end in Seattle's two-tight sets, suffered a torn Achilles' tendon, according to Mike Garafolo of USA Today.

This is not a crushing injury for the Seahawks, but it affects depth. It could put pressure on Willson to develop ahead of schedule for a fifth-round choice. Sean McGrath, Cooper Helfet, Darren Fells and Victor Marshall are the other tight ends on the roster.

Seattle might have been on its way to becoming more of a three-receiver team anyway following Percy Harvin's addition. Teams play with a combination of five running backs, receivers and tight ends on each play, and Seattle would seem to have three wideouts -- Harvin, Sidney Rice and Golden Tate -- good enough to command playing time along with running back Marshawn Lynch and tight end Zach Miller.

The Seahawks had three wide receivers on the field for 32 of the 55 read-option plays they executed during the 2012 regular season and 13 of 23 during the playoffs, according to ESPN Stats & Information.

The chart shows how frequently the Seahawks used their tight ends on first and second downs during the regular season and playoffs, excluding kneel-down plays. There were more snaps with zero or one tight end than with two or more.

McCoy joins the San Francisco 49ers' Michael Crabtree among NFC West players recovering from torn Achilles' tendons suffered during organized team activities (OTAs) this week. Their teams both appear likely to lean on rookie tight ends from Rice to serve as primary backups to established starters. San Francisco used a second-round choice for Vance McDonald after watching Delanie Walker leave in free agency. Willson played with McDonald at Rice and could fill the No. 2 role behind Miller.