Oklahoma coach Bob Stoops released his latest depth chart on Monday, and likely inspired some double takes from some. Of the 44 spots on the offensive and defensive two-deep, seven are occupied by true freshmen, signees from the 2010 class who arrived on campus just this summer. Two have established themselves as starters just weeks into their first fall camps. Kenny Stills , a freshman receiver from San Diego, has earned a starting spot over senior Brandon Caleb at one of the three receiver positions. Elsewhere, Trey Millard , a freshman fullback who played tight end back home in Columbia, Mo., has taken the starting spot away from 241-pound redshirt freshman Marshall Musil , who rumbled for 92 yards in the spring game. Stills is hardly a surprise. He was one of the spring standouts for a receiving corps that struggled outside of Ryan Broyles in 2009, and Stills finished with six catches for 84 yards in the spring game. Elsewhere, two more freshmen cracked the two deep on offense. Joe Powell will back up Ryan Broyles at the SL receiver position and Bronson Irwin , who joined Stills as an early enrollee this spring, will step in behind Tyler Evans at right guard. Three showed up on defense. Safety Tony Jefferson , a 5-foot-11, 198-pounder who is competing to start as the Sooners’ situational hybrid safety/linebacker spot, is listed as a co-No. 2 behind Jonathan Nelson at strong safety. Nelson’s move from cornerback to safety — a formality for some time — freed up a spot for Aaron Colvin behind Demontre Hurst at one of Oklahoma’s two cornerback spots

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Freshman invasion under way at Oklahoma