All evidence points to a MacKenzie-Hunter routing. Circumstantial evidence and common sense suggest a strong Marion Hollins influence (overall site planning, clubhouse location, 16th hole location and par). Samuel Morse indirectly influenced the final routing with certain requests.
The map referred to above and featured in the back of the "Golf Architecture" reprint (and subsequently other books), is dramatically different from the final course. So even if that map was hypothetically influenced by a Raynor routing, MacKenzie and Hunter's in-the-field changes were substantial. The first routing is also in evidence in a more basic and cleaner blueprint that I included for the Cypress Point book (the publisher opted to run them in a cropped format without telling me...). Thankfully, Forrest Richardson has included the full version in his new book (page 463).
A more reasonable attribution in The Evangelist of Golf might have been the same credit given to Raynor at Olympic Club, "Hired, drew plans, never built." There is no evidence to suggest MacKenzie "completed" Raynor's routing, and from what we know of MacKenzie's personality (and most architects), I wouldn't rule out the likelihood that he refused to even look at Raynor's plan, assuming one existed. None of the parties involved, including some who didn't particularly care for MacKenzie (Morse, Joe Mayo), ever suggested in their many letters it was anything but a MacKenzie-Hunter designed course.