User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-432124-20120716061112/@comment-1038387-20120716201654

Keith David was Despero in Justice League. I can't find anything on him being in YJ on his own page, the YJ page, or Despero. So you've either misread that, or it's the usual wikipedia rubbish.