"I disagree with the above."
You sure? Draw a picture...or ping Jobst Brandt, Mr. Sutherland, Damon Rinard, etc...
When you measure an offset to the center of a flange - that number you come up with is an average of the outside and inside spoke offsets assuming the typical half-inside/half-outside lacing.
You can do it yourself by grabbing a hub - measuring the offset to the center of the flange - and then sticking in two spokes and then measuring the offset to the center of of each spoke just before the elbow bend begins. You'll end up with somewhere in the ballpark of 5.2mm to 6.0mm from one spoke to the other as well....
I can provide a picture if you'd like...
What I've stated is nothing new...nor anything I've invented myself...folks much older than I included those noted above are familiar with this - and knew long before I started building wheels...it's old news.
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life