I think MtGox agreed to US jurisdiction
You mean like how they also agreed to hand over their NA customers to coinlab? lol.
Doesn't really matter what they agreed to - at the end of the day a court order is only as good as it is enforceable. You can't just take a court order from any random jurisdiction, show up in another jurisdiction waving it around and expect it will be enforced like a court order from that jurisdiction.
Even if a Japanese court was to uphold a US order (no guarantee that they would regardless of what is written in the contract) that process takes even more time and again they could only touch whatever was in Japan. If the servers are in another country (or the Japanese company is just a shell with nothing the court can touch) there might not be a lot that can be done there.
Coinlab could have a world-wide adventure following these guys around the globe with their lawsuit
