The problem that I was describing is not addressed by this. The problem is that a Person plugin will only output part of the information about a person (in your terms it will be a part of a page - part of the Socratic Ideal page that outputs all of the available information about the person). If the person page does not output the information that the source page would be referring to, what happens? That is the central point of the question I was asking.
I think we only allow links to primary objects. Therefore, a source can point to a person, a person can point to a note, a note (through the new links-in-text) can point to another note, etc.
A People summary page (list of people, list of names) only points to individual people (person-handle.html). You should not be able to link to a summary page (unless you hand-code a link into a Note or an added footer option, or something). Summary pages are generated by the central WebSite generator (which replaces NarrativeWeb).