Ulrich,
Many would argue that running a bulldozer or laying drain pipe is the construction profession, not design. That said, I was sent out to do most of those things, only so I would have the authority to tell a contractor when he was doing it wrong. But I think Jack focuses on design elements more and leaves details like that to others, which we can also argue is best use of his high dollar time.
For what its worth, years ago a construction company guy told me that Jack really did understand cut and fill, once looking over his associates plans and commenting that if "we lowered that fw five feet, wouldn't the dirt balance better with the same effect?" That may be more important than actually running the dozer.
I don't think I could teach Jack anything. As to making courses easier, he learned that from experience.
Personal Jack gca story, when I was President of ASGCA, I asked and Jack graciously agreed to present to our members at the meeting (at Pinehurst that year) about how to play No. 2 and other architectural things. I was warned by his staff not to suggest that he ever copied anything, but as moderator, I couldn't resist, hoping to stir discussion. Jack was of course, very gracious, and said they never copied anything, but rather took parts of inspiration of holes and meshed them together in their own new form.
I was actually a bit disappointed in some of his "How I play P2" comments. Most of it was "Well, you want to avoid the bunkers". Pete Dye also agreed to talk to us that year and his comments were more along the line of the shots he wanted to force the players to make, whereas Jack focused mostly on the shots not to make.