The language is ambiguous, but, I would suggest that we concentrate on locating one site in each system, until it is proven otherwise. With three new potential sites we do have a reasonable chance of finding a third type of ruin.
These new sites, along with those we have already discovered may help us discover a pattern that would unlock further discoveries. For instance, as far as I recall all of the sites so far reside in systems with a dwarf star. If these systems follow that pattern, that might narrow down somewhat the search parameters.
I was feeling a little disheartened about this puzzle, but the spark has been lit again. My Asp is waiting for my return, eager to embark upon the search again.
Fly Safe Commanders 07.