PaPhinz
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They are expected to show interest in Earl Mitchell, a 14-game starter last season for the Texans. Mitchell, 26, could be in high demand, as teams reportedly project him not only as a 3-4 nose tackle but possibly a better fit at 4-3 defensive tackle. ESPN analyst Bill Polian, a former mentor to Chargers General Manager Tom Telesco, is especially high on Mitchell.
Polian gave an "A" grade to six free agents.
Mitchell, a 2010 third-round draft pick, was one of them.
That's from an article about the Chargers pursuing him. Really doesn't give a ton of info but it sounds like the thought was he'd receive a good amount of attention from teams once he hit the market. I don't know much about him but sounds like a good signing from people on the board.
Source: http://www.utsandiego.com/news/2014/mar/10/earl-mitchell-chargers-nose-tackle-free-agency/