Like Argyle, I too have seen all of Yoko's DVDs. In fact I was just informed today by
www.cdjapan.co.jp that they have shipped my order of the newest Yoko DVD - Suika, and the new release with Rio Natsume...so I shall have brand new materials to help with the question.
In my view, Argyle's statement to the weight gain for Yoko is accurate. If you have seen the DVD Spiritual then you will easily note that her breasts are indeed smaller. Mind you, I said smaller, not small.
But the more dramatic and more obvious aspect is that her face is also thinner in that her first DVD. As well as her legs. Her hips too.
I think this is why Argyle and I are calling her growth to be a natural occurence.
I think it also true that most women continue to mature and gain weight as they progress further into their 20's from the starting point of 18 years old. Yoko was born May 26 1982, so she shall be 22 years old in 5 months. I can easily advance the theory that a woman puts on weight between 19 and 22 years.
As for the question of size comparison of Yoko and Rio, I will offer a perspective that Rio is way thinner than Yoko, and shorter, as well as younger. Rio is also just 18 years old now. Her 19th birthday is Feb 20th. She is also shorter than Yoko - 156 cms to Yoko's 163 cms. So her breasts may appear larger as they are set on a smaller and thinner frame.
In any event both models have wondrous bodies. I wonder if Rio will put on some weight in the next few years. Maybe it depends on some more of us keeping her modeling star shining brightly.
FRom New York, this is ...