How many CEOs can you really name?
And anyways, I study in IIT Bombay, one of the premier institutes of India, and quite a few people go to work in Japan, and the general feedback from alumni has been this. I am just the messenger, of an impression that my college students get from people who have been working there.
Look at Japanese demographics. Of the 1% or so outsiders that have got citizenship, most of them are Chinese or Koreans. Of course they have to be willing to assimilate, often by marrying into a Japanese family. Usually they are forced to take a Japanese name.
But they have the most potential, because they CAN assimilate. An Indian like me, will be a clear outsider, no matter what I do.