Ah yes, I had understood. The point I was making (which I might not have expressed particularly clearly) is that I think there's grounds for the possibility of there being much more than just 2 or 3 more sites. Don't get me wrong, I'm not saying there definitely are more sites I'm just saying there's reasons I've seen, other than the scan numbers, to indicate there might be.
I'm also not saying you're wrong about all the scans being accessible in solo! - I'm actually still actively trying to unlock the extra scans in the current site in solo.

Last night I tried blowing the shielding bits off from around the relics but leaving the relics in place to see if that had any effect. Nada. I agree that if it's possible to unlock the other scans in solo then it must relate to something players are doing in open/pg, but I can't really think of anything which could be simulated in solo so am basically trying anything else that comes to mind.
Just discussing possibilities really. Hope it didn't come over in a negative way.