And personally, as great a hole as CPC's #16 undoubtedly is, visually I don't think Mackenzie should have used any sand bunkering behind that green. As dramatic and breath-taking as that entire green-site naturally is I don't think it needed any architectural enhancement at all---other than the green.
Sand bunkering on that grassy/rocky promontory seems a bit more than a little incongrous to me. So why did Mackenzie put them behind that green? Probably just to create a visual key for the golfer. I say, despite how demanding a hole that one might be don't give the golfer a visual key on it---let him figure out where to aim on his own at that grassy/rocky promontory.
To me the holes whose bunkering tied-in best with the natural sand areas on that site were; #1!, #3, #4?, #5, #6, #7, #8!, #9!!!, #10, #11, #12, #13!!.
#14-#18 seem to me to be interesting enough landforms on their own and naturally without sand bunkering---although #14 certainly is cool looking although there appears to never have been natural sand areas surrounding it.