For what it is worth, I pulled out the book again, and found this little gem in 30 seconds:
"Thus the essential rule:
we can place any one luminance value on any zone of the exposure scale, and doing so will determine the camera exposure. We can then read other luminances of the subject, and
these will fall elsewhere on the scale of zones, with each one stop or 1:2 luminance change representing a one-zone difference."
(Emphasis is as printed in the book.)
Adams calls what I am arguing "the essential rule" in the "Place and Fall" section of that chapter. I didn't even know that when I started arguing, but it is nice to find now!
I will also include the three paragraphs that lead up to the one I just copied:
"
Place and Fall
"What we have actually done in the foregoing example is to make an initial decision regarding one subject luminance, and then determine the other subject luminances and their corresponding exposure zones. In Zone System terms, we say that we first
placed the luminance of the middle-gray subject area on Zone V of the exposure scale, and the other luminances
fell on other zones. In nearly all cases using the Zone System, we follow this procedure; we place one luminance on a specific exposure zone and then observe where other subject luminances fall.
"By placing one luminance on a particular zone we determine the exposure settings of the camera, and we have no control over the exposure of other luminances of the subject; they fall elsewhere on the exposure scale according to the one-stop (1:2) luminance ratio described. In our example, we first read the luminance of the gray card (12) and placed that value on Zone V. Having done this, the dark area which read 10
must fall on zone III, since its luminance is two stops, or two
zones, lower on the scale. Similarly, the area reading 15 must also fall on Zone VIII. The results are shown below:
"[chart of exposure scale showing Zone V placement, and Zones III and VIII fall]
"The result is exactly as described earlier, but note that it is the placement of a single subject luminance (12) on a specific zone (V) that determines how all the subject luminances are exposed.
"In the subject cited it is logical to assume that we will want the gray card to reproduce as a middle gray in the print. But it must be understood that we are under no restriction regarding this placement. If we choose for some reason to render it darker than middle gray, we might place its luminance on Zone IV. It and all other subject areas would then be one zone lower in exposure, and one value darker in the print, as follows:
"[chart of exposure scale showing Zone IV placement, and Zones II and VII fall]"
(Emphasis is as printed in the book.)
This one section verifies the main points I have argued, and disproves the main points that you have argued...and yet there are numerous more passages to use as evidence, such as the following, which follows the explanation of where low values should be placed for certain renderings in the print:
"These placements should be considered guidelines. Cases will arise where we do not make our initial placement on these low zones, but we will then almost always at least check to see what luminance falls on these low zones, since any luminance that is allowed to fall lower than Zone II will be recorded without useful detail in the negative. In other cases the subject may require Zone IV placement of an important shadow area to yield much fuller and more luminous detail; I have even placed shadow values as high as Zone V to obtain certain effects of great luminosity, and then resorted to development control to hold the rest of the subject luminance scale within the rage of printable densities. Experience is required to make such judgments effectively."
I do not get the reason for the continued argument when you have been proven wrong.
One more thing:
The quote from the book that you posted:
"Place your shadows, check where the highlights fall, and correct this through exposure if you want them someplace else."
Are you sure that the word "exposure" was not supposed to be "development"?
...and do please give us the context. What section was it in? What was the rest of the paragraph? What was in the paragraphs before and after?