TD,
I agree on best 10% idea, and once postulated that of 400 Ross courses, perhaps only the top 25% would be worth restoring, or his top 100. For most of us, that would be the top 10 at most.
I'm not always sure a gca is the best evaluator of his own work. For instance, if Tillie wrote that we should preserve his course because it has a Hell's half acre, but it was now a high play public, there would still be pressure to change that.
And, if I was putting together my list, TBH, it would probably say, "Please restore the Quarry, but frankly, I think hole X could use a little work." NO design is perfect, even to its creator. So, my thought is that all gca's should document their recollections of design, the whys, the wherefores, and let the future people take that into account, rather than a list. And, I think most restorations probably go that way, starting with the intent to restore 100%, but running across specific features that don't work, or more importantly could work better in today's conditions.