Most difficult key players to replace 

January, 22, 2013
1/22/13
12:24
PM ET
Every year means attrition for college football teams as they graduate seniors and eligible underclassmen declare for the NFL draft.

ESPN Insider KC Joyner takes a look at some of the toughest voids to fill left by departing players, including one Texas A&M player who was one of the most productive at his position nationally this season.
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