Continuing a dizzying set of personnel, strategy and agency changes that started just about a year ago, Mitsubishi again threw everything in the air this week, announcing that its director of brand marketing would continue the long line of senior marketing executives - some of which he himself replaced - out the door. A Mitsubishi representative told AdWeek that Robert Martin resigned and will only work through the end of the week. Martin came in in the midst of an agency review during which almost every other senior decision maker, including the CEO, left or was fired. Mitsubishi sales have been seriously flagging. Before the Mitsubishi marketing group grew farcical, the online community was paying close attention to it because of is sudden - in retrospect, perhaps erratic - announcement that it would shift $260 million of television ad dollars to the internet.