I have noticed that as well. (...) Maybe they think they don't really need a coach... it's just a formality and they need someone to choreograph the programs.?
As I mentioned in my previous post, I don't really agree with this. (I agree with what bluerose said about JSF, though!)
Mao left Rafael very abruptly
She is jus a 17 year old girl who was forced to leave her family and friends behind when there was no ice time for her in Japan. Now, when a new rink was built, it is no surprise that she prefers to stay close to her family. And she could hardly ask Rafael to just give up all his other students.
Fumie seems to change coaches at least once a season.
Well, not really... She used to work with Nobuo Sato, but not only he started to have too many responsibilities as a coach (working with Yukari Nakano, Takahiko Kozuka an others), but Fumie, just like Mao, had troubles with having enough ice time. She went to USA, where she worked with Vasiliev. Then she met Zhulin there and he created some programs for her. She enjoyed working with him, so she moved with him to Russia. She is still working with him...
Shizuka was working with Terosova until Morozov became the "in" choreographer/coach.
Actually, I think that until Shizuka's success Morozov was mostly known as choreographer... He coached some dance teams and Kevin van der Perren, but it wasn't until Shizuka when he really became known as "champion maker".
I think it's surprising that Shizuka switched away from Tarasova, her previous season was disastrous and she needed some change. It certainly worked well for her. How is her decision different from those made by Michelle, Sasha, Brian, Johnny, Kimmie, and many, many other skaters who decided to change coaches?
Miki is back and forth between Morozov and somebody in Japan.
All of the Japanese skaters who are students and who have foreign coaches - Miki, Daisuke, Nobu - have coaches in Japan with whom they still work (Yuko Monna, Utako Nagamitsu, Noriko Oda). That's because they are students and they have to show their faces at their respective Universities sometimes... And I doubt that their coaches could just travel with them every time, leaving their other responsibilities behind.
I don't really remember about other skaters, but I think Nobu spent more time in Japan than in Canada with Barkell... He was just visiting him for a few weeks at time, learning new things, then going back to Japan and polishing them while working with Noriko.