Ah, i see, thanks for clearing that up. (i had wondered if the question was asking for a birthplace or historical origin.)
The idea just happened at random, really. The FS2 story obviously has inspired many people to speculate, so i'm just another of the crowd. My reply to Mars should help to explain the race's name --it seemed to make sense to stay with a deity-based theme.
As for the plotline itself, i share your opinion as far as "another race" being a key to the Shivans' behaviour throughout the game. At the same time, though, i'm fully aware that a logical outcome might not be possible. Writers do sometimes write themselves into corners where no satisfying reason can be given for whatever happens in a plot. Or, a writer may start a project then abandon it in a state where any subsequent writer would struggle to find an ending.
Despite that, it still was entertaining to try making sense of events like the Capella detonation. My thoughts on that evolved as such: subspace manipulations aren't typically undertaken near stars(?) --> subspace manipulations may disrupt stars(?) --> 80+ Shivan juggernauts all manipulating subspace might disrupt a star cataclysmically --> the cataclysm presumably creates a nebula --> the Shivans are known to use gas miners in a nebula --> the Capella nebula was intentionally created to supply gas(?) --> the nebula is a supply depot(?) --> military supply tends to use depots on defense --> the creation of the Capella nebula-depot means the Shivans are on defense(?)
Once one supposes that the Shivans are on defense, the next step is to suppose an aggressor. Hence, the Guan-di.
