I was going to say exactly what Brad did. Ross wouldn't have qualified for the Society in 1900, but once he got his practice going, his set of plans was better than those produced by most architects today. H.S. Colt and William Flynn also did excellent plans. I haven't seen enough of Tillinghast's to comment on his.
Dr. MacKenzie clearly didn't have the patience for such plans, even though his routings and his green details gave Russell, Morcom, Fleming and Maxwell enough information to do something right!
However, the ASGCA isn't always a stickler for such plans. Pete Dye could draw them, but he doesn't, and they don't question whether he should be an architect. They let Bill Coore join, even though he was up front about the fact that he didn't work that way. And I've been told they would treat me the same way, except for the few members who have a large chip on their shoulder about something I've written in years past.
However, to go back to the original question, I think if Donald Ross arrived in Massachusetts today, it would take him a hell of a long time to establish himself in the profession, or even to get his foot in the door. I'm certainly not questioning his talent; it's just a much more competitive business today, and there are a lot of other apprentice golf professionals who'd love to be architects, too.