Recently, Ryu seung-min wanted to adopt a kid from China and train him to be the next big champ. The govt turned his request down. Somehow, there is a feeling in Korea that Japan might get the next olympic gold courtesy Harimoto although he is Chinese and Chinese have something in their genes to excel in TT
Maybe RSM has some Chinese genes too then
Same as Yoo Nam Kyu
I think in Harimoto's case, he gave up his Chinese citizenship to become 100% Japanese (this is the requirement of become Japanese citizen - they don't allow due nationalities)
A lot of your "exports" tend to still hold onto Chinese passport/citizenship.
So there are a lot of doubts of the "purpose" of moving over.
I guess with Harimoto, he is more Japanese than he is Chinese now
In today's table tennis in these strong TT countries, other than having a well skilled kid, the parents would also need to have the money and connections to make the kid "complete"