Patrick, the hole played at 182 yds. when work on the 18th began. He placed a new tee behind the road and extended the hole to 225yds. Egan did in fact try to build a new tee for 18 on the rocks behind the present tee and slightly to the right. In fact in aerials today, if you look behind the 17th green, you can see flattish looking rock outcroppings. In 1928 Egan experimented with a tee there, but it did not last the winter. Perhaps this is another reason Morse did not allow Mackenzie to build the tee on 18 at Cypress Point Club. The 17th green was also dramatically changed. I believe the original tee for 18 was somewhere where the stands are placed for tournaments for the 17th. I have to make a correction to a previous statement I made as well. Fowler ENVISIONED the 18th being a par 5 before Egan. Fowler actually completed the work in 1921. So yes, he did the work seven years before Egan AND had the idea before him, but Egan also tried to extend the tee even further with the experiment that I mentioned. He also reworked the green there to make it more difficult so only a precise third shot would get close to some of the pin locations.
My question would be, if he redid the green with what he had in mind on extending the tee even further than what Fowler did, does it change the strategy for the green because that tee couldn't be used?