Right, with Isyander's quest. After reviving the dust based planet sized life forms nothing happens.


1. I think there should be a follow up quest where you can research to communicate with them and perhaps get a portal like ability between the planets or something.. since they are "old gods" or they form their own faction in some way.. 


2. There is also the "lodestone" where the argosy starts that seems to have a similar activation ruin which doesn't fit into the story. Perhaps a project to seed a planetoid with it.


3. Is not auriga one of these planets? Perhaps it can be restored too after you have restored the others, as in they work together to repair auriga