What about Yuna's PCS rise in 2010? It was the same like Sotnikova's this time.
That took more than two years, after bringing home gold, silver and bronze for every competition she's ever been in. Not two months.
Oh, and let me tell you. During a year and half coming up to the Worlds and eventually in Vancouver, Yuna lost once, to Mao, and once only, and it was at the GPF that was taking place AT HER OWN COUNTRY. Her PCS didn't skyrocket conveniently for the Olympics that takes place in her own home country.