Bee, it is confusing stuff. Let's try.
1. The North Fork used to have its own quota, apart from the general 150 Dayhikers limit, Yes?
No. I believe there was no quota for NF dayhikes. Can't remember what the overnight was.
2. The overnight permits for North Fork remain a smaller, separate, quota, yes?
Yes, 10, as opposed to 60.
3. Currently, the North Fork is now lumped in with the 150 Dayhike passes as combined with South Fork, yes?
Yes, but it is 100 total spots.
4. Most --if not all-- of the technical routes to other local peaks originate out of the North Fork, thus, many folk do not ultimately remain in the area, but must access the North Fork to reach their destinations, no?
Yes, (not all, southern mountains generally accessed by southern trailheads)but that is a hard number to get at. I suspect a very small number.
here is the Inyo site:
inyo Whitney permit info