Aaron McGruder has been all but silent since news broke about his exit from the edgy Adult Swim series 'The Boondocks.' It's a development that leaves fans worried about the show's satirical humor.Clouded by a stunning creative split and a hiatus that stretched close to four years, "The Boondocks," the edgy animated comedy about two young African American boys from the inner city grappling with life in the suburbs, is finally returning Monday to Cartoon Network's Adult Swim block — a relaunch being greeted by the show's legion of fans with both celebration and concern.