"At this point, the Nirvana Plan should be considered a success?"
"Of course, a great success."
The campaign against the Son of the Evil Gods, upon returning to the homeland, sparked world-scale cheers.
After all, that year's war was the closest humanity ever came to extinction.
The truth is, if the battlefield hadn't been home turf, if the warriors of this world hadn't desperately dragged him into the world, using Earth's "trap" to seriously wound him, we would have had no choice but to watch it slowly devour Earth.
The loss of the Mother Star means so much to a race that it needs no further explanation.
Finding a new home like the Saphire People and becoming a subservient race to humans still counts as lucky..... most wandering races vanish into history over time.