Think about it Reshiram is a white colour and oshawott is white colour on his head and zekrom is black color and tepig is black colour on his head and bottom so that means Oshawott black version and Tepig White Version cause Yin means water and Yang means Fire.

Dude it doesn't matter. You can pick whatever starter you WANT to have in Black or White. Oshawott is in both versions of the game so is Tepig. It has nothing to do with the names of the game, except for the two legendaries: Reshiram is white and his opposite is Zekrom and is in the White game, whatever.

There is no underlying meaning. It's a GAME!