If the mystery man at KJUs side is Choe Chun Sik, it is likely he was listed last because he is neither a member nor alternate of the KWP Political Bureau and DPRK news writers listed the attendees according to their Political Bureau hierarchy. Choes attendance was likely a last-minute addition. His appearance at KJUs side reflected his status as an honored guest at the memorial events, but because he is not (as yet, any way) a Political Bureau member/alternate, his name is listed further down in state media reporting.
http://nkleadershipwatch.wordpress.com/2012/12/17/mystery-man-at-memorial-events/