Two comments,
1. I doubt that there are or have been more then five truely one man shows archtiects throughout history. Does anyone really work truely alone, drafting, auto-cad ect. No delegating. I know one, Kelly, thats it.
2. Pete Dye was as close as you come but admitts he was fortunate enough to have clients that didnīt require much in the way of plans, he was hands on in the field and admitts he can not draw. Sure Tom Diak worked for him, but it was so early on in his career I doubt he had much input. I remember Alice saying somewhere, "Well he just pestered Pete so much for a job, that Pete finially gave in and sent him out to pick up sticks or something like that!"