All my fave developers are Japanese.
This list was made American voters so obviously a Western developer would be top. Miyamoto would be top of a Japanese poll and there would be far more Japanese developers in a Japanese poll.
However, Miyamoto may have fell off as he started focusing on casual games so lost admirers.
There is still no reason to exclude Hideo Kojima from the list though, he has NEVER dissapointed, he listens to his fans.