Kyle,
Rick Woelfel's research is normally far better than woeful. In this case, I don't believe the case he makes is based upon any documentary evidence at all because, as you know, there isn't any...yet.
John Reid is a likely candidate for early work in and around Philadelphia. The fact is Park was not in the US until 1916 after is 1895-1896 trip. I'll have to ask Bob Labbance how he knows this but I trust his research skills...he's one of the best at finding information. Given this, he could not have revised Reid's nine holes and added nine at the time the South course was expanded to 18 holes. I don't know where Rick got his information but it seems to be based on oral tradition rather than fact.
Mike, that Philmont member you had lunch with must have it wrong because Andy Karff, Bob Labbance and others that have been looking for such material for ages don't have anything. Whatever changes were done in the not too distant past were likely based upon aerial photographs and not original plans or designs. If they were, I think we'd know of their existence.