No time to read, will just read the first few and skip to the end.
I hate the way GTVA handled them allright, but in a different way.
The saths are trapped in capella. NOT DEAD. And its impossible they can build 80 collosi to beat them then they finally open the node.
Shivians have been shown to be capable of opening nodes, no gurantee they won't attempt something like that.
Also, they could also full power to engines and head towards the nearest system (in system warp to the edge and then just speed off from there). Sure it will take time, but travel is possible without a subspace node...
In fact, this would make a great FS3 plot if it was ever made, or at least a good user made campaign... the return of the sathani.