Not sure how true the statements are but in the CoinDesk article above, it says some kind of court decision that happened in the British Virgin Island (where OKPAY is located) forced them to pay Gox...

I think OKPAY forgot to check the official statement at Gox's site before going to the court. Well done.
https://www.mtgox.com/img/pdf/20140521_announce.pdf (English is in the second half.)