We also never hear if it has other worlds that have been seeded with humanity, each world with its own set of incubators farming Grief, and Kyuubey needed a certain amount to justify getting transferred instead of "retired" in a very terminal sense.
No need for them to seed humans, the explanation to Madoka includes a reference to humans being an exception due to how organized they are even with emotions, but in no way is having emotions something exclusive to them.
Plus, the Psp game has a superboss witch whose description says comes from another planet.
Incubators don't seed planets, they just find emotional species in the wild and begin exploiting them. There are aliens out there in the PMMM verse.
I wonder if the formation of Wraiths/Demons is what originally caught the Incubators' eyes, or those of their creators. Spontaneous generation of life forms like that has got to be rare, and there had to be a time before contracting ever started.
they probably see it as a quirk of magic, a significally inneficient quirck of magic that is unnecessary compared to witches
We know what caught their eyes, it's just having emotions, more precisely, it's the fact that emotional beings produce a little more usable energy than they use during their lifetime.
There are no wraiths before Madokami, they are an immune response to her wish, so any explanation based on them existing before her are wrong from the outset.
Madoka's wish eliminated Witches. The continued need for meguca, and the formation of Wraiths suggest that Wraith generation may have been the natural state of thing, early in humanity's development, where they had reached enough intelligence and complexity of thought for emotional energy to start having a measurable impact on the world. There would have had to be something there, before the first incubator contracted magical girl, before the incubators decided humanity warranted a closer examination and manipulation.
Actually, there has been a precision in, I think, Wraith arc (remember it is said, not sure where) that Wraith are an immune response from the universe to try and removes the possibility of another wish on the level of Madoka's.
For *the natural state of things before the incubators* you are mistaken, Kyubey says in his explanation to Madoka that all emotions are negentropic naturally, but that without his system the only effect of it is that emotional beings create a little more usable energy than they use during their lives.
There is no need for any ennemies before magical girls come in due to Kyubey, and in fact, no need for any for the first magical girls, for them, you just need to have them live, which creates grief, then since they don't have any way to remove it from their gems, they inevitably witchout, and now you have witches in circulation for the next ones.
