Maria, I'm sorry I missed your last post above. (I just noticed this thread when I came to read Paul's.)
I must say I think it would be hard to get at that question now. Those generations are gone and the situation has changed -- the country, the company, the school. It's much more international now. Kobborg was actually trained outside of the RDB. He was in the school for a very brief time. He worked intensely with Peter Schaufuss when Schaufuss was director.
In the 1940s and 50s there was a long list of world-class Danish dancers. Some of them didn't get out at all, but still had a world-class technique. And they were born about two years apart. From memory, in age order, they were: Frank Schaufuss, Poul Gnatt, Stanley Williams, Erik Bruhn, Fredbjorn Bjornsson, Henning Kronstam, Flemming Flindt, Niels Kehlet, Anker Orskov (died in his 20s). They were all produced under the old system -- only two classes in the school (you'd posted elsewhere that you'd read my biography of Kronstam and nearly all I know about the schooling system is in those early chapters).
Of these people, only Flindt and Kehlet are still alive.
The next generation was trained by Vera Volkova and Stanley Williams, as well as Hans Brenaa and Henning Kronstam: Flemming Ryberg, Jorn Madsen, Peter Martins, Adam Luders, Peter Schaufuss, Aage Poulsen. Then there's Arne Villumsen, Ib Andersen, and then there's a big gap until Alexander Kolpin (now retired; injuries), Nikolaj Hubbe. There are still good dancers -- very good dancers -- but not at quite the same rate as in the 40s, 50s and 60s. (Tomasson was trained by Danish teachers, but not at the RDB.)
I don't know how much material there is in English OR Danish that would make up a dissertation -- I share your question

It was one of the impetuses behind my own research. I think a great deal of it was that there were always great male dancers around -- good role models. And there were good men's parts to dance.