Posted by ESPN.com's Tim Griffin
One of the most interesting parts of spring practice will be watching potential replacements emerge in key situations across the Big 12.
Here are some of the key departures from around the conference and some of the players who will compete to try to fill those vacancies.
Texas Tech wide receiver Michael Crabtree -- The Red Raiders will miss the two-time Biletnikoff winner. Lyle Leong will get the first shot and should be challenged by Jacoby Franks and 6-foot-4 Rashad Hawk. Top returning receivers Detron Lewis and Tramain Swindall will remain inside as slot receivers, meaning that other players will have to emerge at Crabtree's old featured slot.
Texas' pass-rushing specialist replacing Brian Orakpo -- Texas coaches are hoping that Sergio Kindle will ratchet up his play to Orakpo-like levels as he moves to a near permanent status as a pass-rushing specialist at defensive end. Sam Acho will get most of the work on the other side during the spring with Eddie Jones battling back from shoulder and ankle surgery, meaning the spotlight will be on Kindle this spring.
Jeremy Maclin's talents at Missouri -- It likely will take several players to cover what the multi-purpose Maclin provided as a receiver, rusher and kick return threat. Among the players who will get a look at a variety of roles include Wes Kemp, Jerrell Jackson, Gahn McGaffie and Rolandis Woodland.
Oklahoma fills a depleted offensive line -- Only tackle Trent Williams will be back as a starter for the Sooners' unit, which will lose key producers like guards Duke Robinson and Brandon Walker, center Jon Cooper and mammoth tackle Phil Loadholt. The four departing starters combined for 149 starts during their college careers. Replacements like tackle Cory Brandon, guards Alex Williams and Brian Simmons and center Jason Hannan are presumed to be talented, but are still very inexperienced. That's not a comforting thought for returning Oklahoma quarterback Sam Bradford -- at least until spring practice begins.
Kansas State replaces Ron Prince -- Sure, the Wildcats made only one bowl trip in Prince's three-season tenure before he was fired. But it will still be a huge test for legendary Kansas State coach Bill Snyder to match the success he produced earlier in his career after his sabbatical during the Prince years. It will especially be challenging this season with the loss of quarterback Josh Freeman and offensive coordinator Andy Ludwig, who went packing late last week for a similar position at California after only six weeks at Kansas State. Junior-college transfer Daniel Thomas and Carson Coffman will compete to replace Freeman. And it's anybody's guess whom Snyder will find to replace Ludwig with the start of spring practice approaching on April 6.