Ah yes, you're right! There is still a spring inside of the Primary Pressure Regulator that would either bleed off the difference in excess pressure from a clogged injector, OR would close in order to compensate for the loss in fuel pressure from an injector with a weak spring. In either case, this would still maintain the proper operating pressures in the remaining upper and lower chambers of the Fuel Distributor.
So minor correction there (thank you, Ron!), but I'll stand by everything else.
For everyone reading this out of curiosity to learn more about your fuel injection system, it seems complicated, I know. But don't worry. This is where K-Jetronic trades off physical labor for mental labor for problem solving.