What happens with early balding in different Norwood Classes?

For men that experience AGA, does every single hair follicle in the respective balding area (based on their Norwood level) always eventually miniaturize and stop growing, leaving that area total hairless and bald? Or, in some people, can just a percentage of the follicles in those respective areas be afflicted while others in that same area are DHT resistant and never miniaturize? So like, for instance, let’s take someone with a Norwood 3 Vertex pattern; in the crown area, is it always a guarantee that every single follicle in that area will stop growing and leave a totally slick bald crown? Or can some of the follicles remain unaffected based on the person’s genes leaving just a thinned looking crown as opposed to a completely bald one? I ask because usually when I see receded or bald men, even elderly men with a Norwood 7, their bald areas usually aren’t totally hairless and slick bald. There’s still some remaining terminal hairs to various degrees in those spots.

You are astute in your observations:  Some men with Class 7 patterns may have a few remaining hairs right in the middle of the balding area.  I remember one man I transplanted who actually knew that there were 7 hairs in his balding pattern and gave names to each one of them.  Those with a Class 3 Vertex pattern may not develop complete balding of some of the crown, but most do, not necessarily enlarging the balding crown with a complete “Friar Tuck” look.  If I remember correctly, OJ Simpson’s attorney had a small completely Friar Tuck bald spot, seen from behind.  These Norwood patterns described are usually complete, but it may take years to get there.