a soldier made ha dramatic across the border. >> someone will to pay for it. and it may have been wong being a senior official. >> reporter: but analysts say he was involved in a power struggle with cha to have close ties to jimmy family. he has taken over his job. likely a revenge play that wong made three years ago. >> we know wong replaced cha as head of political bureau in 2014. if you look at the formal leadership lineups of the two l of the north korean leadership, the two have interchanged places on a number of occasions, which would suggest a possible rivalry. >> reporter: analysts believe it's possible that so amassed too much power.