You are oversimplifying. My understanding is that Japan has a residency minimum time requirement for applicants for citizenship, and due to living and training in Canada, there is no way that Mervin can qualify in time for the Olympics. Due to lack of suitable elite-level coaching in Japan for pairs, moving to Japan and training is not a realistic option for them, either. Unless the appropriate Japanese government entity makes a special exemption (I do not know if their regulations allow for exemptions), Mervin won't become a Japanese citizen and so the 2014 Olympics is out for them. It is unfortunate.
Another issue: I believe Mervin is a Canadian citizen (someone correct me if wrong), and while Canada allows dual citizenship, for adults Japan does not. Mervin may not wish to give up his current citizenship, which carries some value. One cannot say this is the same state of affairs for holders of Chinese citizenship, many of whom are doing everything they can to find and carry a different country's passport.

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