Chris,
Ron Whitten sent me clippings from The Daily Oklahoman in 1926 confirming that MacKenzie was in town, saying that he and Maxwell were forming a partnership, and that MacKenzie would be involved in the courses.
In truth, Maxwell had already been contracted and probably had something laid out, and then when they formed their "partnership" Maxwell thought it couldn't hurt to have MacKenzie's involvement. But as far as I know, this was his only visit to Oklahoma and the courses weren't under construction yet, so the Doctor could only have contributed his thoughts on the routing plan.
I have no idea what of the current course is "original."