I don't think that is natural. To think they are related? Sure. They are: the 6S is an evolution of the 6. But it's not like they released the 6, the 6a, and t

I don't think that is natural. To think they are related? Sure. They are: the 6S is an evolution of the 6. But it's not like they released the 6, the 6a, and the 6b all the same year. It's quite clear.