In 2009 "DO" (who I assume is David Oliver) wrote that his training mate Xavier Carter had shown great courage in fighting injuries, so Carter had surgery in August 2009. In 2010 Carter placed third at USAT&F ran 20.14 but faded at the end of the season - understandable for a recovery year. However, in 2011 Carter ran 20.53, and failed to make the USAT&F final.
His 20.53 is 0.02 below the Olympic "A" standard, so he can run in the Olympic Trials, but he needs to return to his form of 2006 & 2007 to have a chance to make it to London. Does anyone know what he is doing?