I'm not sure. I know Vika has had a lot of psychological problems with her coaches; also, Victor has complained about Vika's mom and grandma trying to push her way through. Sokolova was an example that Victor sighted in a recent interview as the most painful one when she left; he explains that he understand that sometimes a skater may grow tired of a coach, but in Elena's case he really felt she had no reason to leave (I may dig out an interview I've read with him on the subject). Victor also said that they now have a lot of ice, so they have no problem fitting all the skaters in. Also, I think all three ladies must have learned some humility from the experience. After all, all of them left "never to come back", yet are now back. BTW, officially Julia is also working with Victor, and I am not sure if Vika working with Marina was just a half-season solution, or one for the whole season. All ladies seem to be smart enough to go elsewhere for choreography -- the Kudryavtsevs may be great technicians, but they are no choreo geniuses.