I am convinced of this time line:
Jehovah created Jesus, Jesus begins creation by creating Satan. (Whoever he was before becoming Satan.) They were the first two created beings. Also, because it is the nature of the creator to delegate, and because he delegated creation to Jesus, Jesus in turn would delegate creation to those he created. I think it's not only possible, but likely Satan actually created mankind. But as the question goes, "who created the creator?" ANSWER "NO ONE." Because, whoever creates the creator, is the creator, until that person has no creator, and that person is Jehovah. This is why Satan is so arrogant, so pissed and thinks he's so justified! In his mind, because he "created us" we belong to him, and he wants what he thinks "belongs to him." Our worship. Keep in mind though his "creation" would still be "Jehovah's creation" until Satan sinned. So anyhting the angels did, prior to sinning would be in harmony with Jehovah's purposes.
Also, think of it this way, Satan's "blueprint" for making mankind would come from the knowledge and power Jehovah gave Jesus that Jesus gave Satan.
So when Satan, created mankind, he not only had the blueprint for angels and pretty much everything else in his nature that was given to him in the act of his creation, he saw how, in his mind, inferior humans are to angels!
I believe the story of Jacob and Esau is a parallel to the story of Jesus and Satan, with some variations. Satan sold his birthright, by wanting something that did not belong to him. In a sense they were "twins". Jacob and Esau were not identical twins, and so I think there is some similarities in that way as well. Esau wanted "instant gratification", and did not care about his birth rite, possibly because he didn't think he needed it.
In any case, we get no meat to chew on from WT...but I guess that ends up being good for some of us whose minds never stop trying to figure things out!