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Of the six former OSU players in the NFL playoffs, only one rides the pine.
Zac Robinson (#5) is a backup QB for the Cincinnati Bengals.
Everyone else has seen plenty of playing time, but injuries have been an issue.
Lane Taylor(#65) plays for Green Bay. Taylor did not play the last three regular season games, and was a "healthy" scratch (inactive) against the Bears in the season finale, as the Packers made room for a third QB with Aaron Rodgers coming back from injury. Green Bay has no inactives listed for today's game, so I would expect Taylor to be suited. He appeared in 10 games this season, so there is a fair chance he could see some action.
Seattle is all about offensive linemen, as Russell Okung (#76) and Michael Bowie (#73) have both started. You might remember Bowie, who was booted from OSU for a violation of team rules. He eventually finished at Northeastern State, although the Seattle Seahawks official website lists Oklahoma State as his college. He suffered a severe shoulder injury in the final preseason game after having a great fall camp, but finally saw time against Jacksonville on 9/22 due to injuries of other starters. He started the next 6 games, but then suffered a knee injury in 11/3 vs Tampa Bay. He started the next week in a win over Atlanta, but did not play again until a loss to Arizona in week 16. He was inactive for regular season finale against St Louis. His status for next week's playoff game is unknown.
Okung is firmly implanted as the starter at left tackle, but has battled injuries his entire career. He only played 10 and 12 games respectively in his first two seasons due to health issues, but managed 15 games in 2012. He tore a ligament in at toe in the 2nd regular season game of 2013, but came back 11/17 and started the final 6 games of the season.
Kendall Hunter (#32) and Perrish Cox (#20) both play for San Francisco. Besides Okung, Hunter has probably enjoyed the most recent sustained success of any ex-Cowboy, but his time has also been marked by injury. After playing in all 18 games his rookie season, Hunter's season was ended after 11 games in 2012 with a torn achilles. He made a tremendous comeback and played in all 16 games this season.
Cox started the season with the 49ers, but signed with Seattle after being let go in November. He was promptly cut by the Seahawks, but was recently resigned by SF for depth in their secondary due to some injury issues.