"Sounds like they come from heaven"
Agree, so if they come from heaven, does that not indicate that there is a specific number of souls created, long long long ago, and part of the requirement to have everlasting life is to be born of woman. Jude refers to some who left their habitation and refused to be born of woman and they have already like Satan received the 'death' sentence.
So if this is the case would it not be when the last soul placed into the womb be also a signal for the end.
A thought to think about.
In response to 1481, I have often thought about that too.