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I used to work with a guy who was happy to be demoted because he couldn't stand to deal with HR shit, didn't like all the hassle of having to supervise other people, revise payroll, etc. Essentially a guy focused on a niche at work, and the best one at it, but had no interest in promotion because he was not competent at the additional responsibilities.
Tajiri is probably in a similar boat.
Completely scrapping the original version of a game, working on a remake when Nintendo is breathing down your throat for a sequel, it's pretty obvious the dude isn't a company man.