Wow, I like theory threads and this is perhaps the most theoretical I have ever seen here! So, hear, hear! (or hip hip hooray)
My ranking as a gca would be:
1. Experience
2. Reason
T3. Early Writings and Tradition. In a way, aren't they the same thing?
I cite the first two based on the old Groucho Marx line - "Who are you gonna believe - me or your own eyes?" I also use reason because design really is like the scientific process - figure out the problem, test some theories, design something that fits.
With early writings, I would want confirmation on the ground that the gca's in question really put their theories out there. I know that some of that writing was as much for then current marketing as much as it was for posterity as well as guidance to future gca's. As such, it may be somewhat misleading - trying to make it sound just complicated enough that greens committees didn't want to try architecture themselves!
That, combined with the fact that their writings really weren't all that detailed - did they ever say how theory might change if designing a public course vs. a private one? - and my design situation might be different - say designing a public course vs. a private one
- puts their written advice to me in a lower - but not excluded position.