I'm only supporting this via this thread, but it strikes me there are 4 pillars with relics on the top, and Ram Tah suggests 4 new systems to search; I don't think this is likely to be concidemtal. To me that means the pillars are part of the comms network and the obelisks are the library store of the Guardians. Hence the clue to the other ruin sites must lie in the pillars.
Correct me if I'm wrong, but I think the pillars carry glyphs on their bases but they are the same for each pillar. I don't think anyone has noted any differences in markings/size etc of the pillars. In that case could we have a set of hi-res close up pictures (from several angles of each one) of the relics at the top ? Cmdr Thatchinho posted a set for one pillar recently & I think there are some internal marks that might be relevant.
I've got images for all of them. I'll post them in a little while... mobile only atm.