Re Nancy Kerrigan: At Worlds '93, Nancy went from 1st after the SP to 5th overall after she bombed the LP. She already had a bronze medal from the '92 Olympics, but she was gunning for gold. Like Cohen, she had never put together a clean short and a clean long. Therefore, after her meltdown at '93 Worlds, Nancy and her coaches, the Scotvolds, who were also Paul Wylie's coaches, put together a totally new training program for Nancy.
I don't know all the details, but I know she did a lot of off-ice training, lost about 10 LB, worked with a sports science person about how to time her training so she would peak at the Olympics, which included how quickly to move her along into single, one and a half, and double runthroughs.
So, like others, I'd say Nancy didn't add any new jumps; however, she improved her consistency so she could have a much higher percentage of doing all her jumps in competition.
Speaking of late bloomers with consistency, the same thing happened to Paul Wylie. IIRC. Paul Wylie won his Olympic silver medal at age 27. I'm not sure about this, but I think that's the only international medal Paul Wylie has. I don't know if he ever even got on the podium at Worlds. OTOH, he was going to Harvard until he took off time to prepare for the Olympics.
My feeling is that new jumps can't be added after 20, but with the right training consistency can--at least for one season. If we're using Nancy as an example, I guess it also helps if you get really POd because a rival was responsible for some guy trying to break your knee.
Rgirl
P.S. These aren't figure skaters, but tennis star Martina Navratilova and prima ballerina assoluta, Natalia Makarova, kept improving technically in their respective activities by working with the smartest, most cutting-edge trainers in sports science available. Athletics, like dance, depend a lot on tradition, but the technical demands keep increasing. You'd think if actors work with Olympic calibre trainers that Olympians would, but they don't, at least not in sports such as figure skating. It's been 26 years since advanced degrees in sports science, exercise physiology, and sports medicine were added to various university curricula. Fumie Suguri, according to Terry Gannon, has an undergrad degree in sports science. Hopefully Fumie will escort figure skating into more sophisticated training practices so skaters can keep up with increasing technical demands with minimal risk of injury.