That's interesting, when I watch Ayano play, I actually feel that the best aspect of her play is how consistently she returns serve. But sure, I get that there is a huge difference between 2300 and 2800.
Just having a look at the USATT rankings, I see the highest ranked US-trained players are Kanak and Lupulesku.
Kou Lei, Ma Jinbao, Xin Zhou are all ranked very high, and funnily all from the bay area. Are all of them professionally trained from China? as in former national team or provincial team players?
Kou Lei was once in the CNT, and both Ma and Zhou played for Shandong.