QUOTE
Interestingly, the Bolshoi style evolved to the "big, muscular, showy, overtly athletic works" mentioned in the quote above, probably (in my opinion! smile.gif ) because of the influence of Stalin and his preference for "big" things.
According to Karsavina, if I recall correctly, during her time as a student at the Imperial school and with the Imperial Ballet, the difference between the Imperial Ballet and the Bolshoi was that the former, modeled on the French school, strove to be extremely refined and graceful, whereas the latter had a more showy style, not bothering to hide effort, less refined, &c. So it would seem that the Bolshoi's big, athletic style has been around for quite some time!
Also, I feel it is important to note that one can be trained in the Vaganova method (or perhaps I had better say in something very similar to it) without acquiring the Mariinsky style. Others know more about this, and I would like to hear from them on the subject--I recall reading that in the Soviet era, all state ballet schools in the USSR used the Vaganova method of training, including the Bolshoi, Perm, and Kiev schools, yet all of their affiliated companies have different styles. I usually find it relatively easy to see the differences between the Mariinsky, Bolshoi, and Perm--I have less experience with Kiev graduates, although I do know one--maybe I can ask her about it.
So while Vaganova developed her method primarily to allow her students to dance at the Mariinsky/Imperial Theater, and the Mariinsky ballet has certainly kept its principle of refinement (although, lately, not necessarily restraint) one can be trained in the Vaganova method yet dance in a company with a different style--certain styles, of course, will be easier for the Vaganova-trained student to acquire than others.