Does Ocato fit this model? Naturally, it's never a direct imitation of the real world far east, but if it is even in part, is Ocato as well? I put it to you that he is not. I feel like he is an example of the fictional world having taken on a life of its own. He fits with the lore, not with any supposed model of the real world.
Depends on what real world model you're looking at. It breaks down if you say Sumerset Isle is to the Empire as Japan is to the USA, but it works well enough if Summerset Isle is in part to the Empire as Greece is to Rome; the Romans employed Greeks at all levels of government, and some even became Senators.
I agree that the TES world also has a life of its own, like any fictional setting; all of the cultures are weird mixes, with fiction trumping history.
Akavir is really meant as the Japan / China anolog.