Peter - I will use the words master/disciple, even though I am not sure that they are politically correct
I certainly think that most evidence would indicate that the disciple usually does less than the master. However, I think there are several factors that work against the disciple.
First, often times, the disciple gets less opportunity than the master. The master simply doesn't step away and let the best opportunities go to their disciples. In fact, especially at the beginning of the disciple's solo career, he is only getting opportunities that the master does not want.
Second, building a golf course is a business. Owners want to market the bigger name....even if they feel like the disciple could do similar work. So until the master retires, it is hard for the owner to take a risk on the disciple.
Third, many of the great architects were able to make their names during "boom" times of golf course construction. Boom eras don't last forever and often the master does much of his work during these boom times. By the time the disciple has obtained enough experience to go solo, the boom era has ended. It had to be a lot easier for a disciple to go out on his own in the 90's and early 2000's, when new course construction was much more plentiful, than today. For example, if a disciple worked for 10 years under the master from 1997 to 2007 in order to gain his experience, he would have lost the boom era only to be given 2008.
Lastly, in today's market, many disciples have to take restoration/renovation work and hope to make a name for themselves there. Much harder to do than building a new course for many reasons. The architect is usually limited by what is already in the ground. Also, when you build a new course, you make the owner happy and members join because they like the golf course. Those people that don't like the course, just don't join (and usually aren't vocal about not liking it because they have no attachment). Meanwhile, when you renovate a course, you usually have a group of members, all with divergent views on what should be done. When the work is completed, even if it is really well done, you usually have a group of members who are upset with the architect. These members, while often wrong in their criticism, are often the most vocal. Tough environment to build a career.