Just like that time passed, his infant form was unable to contain all his power. To deal with it he slept, and dreamt to those in the waking world he looked and acted like any newborn infant. However his mind drifted in the warp, like time before his body was in the physical realm while his energy deweld within the warp.
As he drifted he bore witness to the dangers within this new realm; the Dark God Dark Side, the God of Light the High Father. The beings of hypocrisy the Guardians of the Universe, how many deed had they been responsible.
Then the C'tan of this realm, just looking at them made him smile. To think that Humanity had not only taken them but proved capable of using their powers made him proud. However they needed to be captured first.
Then came the sight that disgusted him; Zeus and his Olympians, the traitors God, Captain Marvel the champion of the chaotic power of Order. As much as he wanted to kill them he had learned from his mistakes.
Humanity needed a God and it could not be him, ultimately he had failed. Then he saw it the presence the true God of this realm, it was this realm.
For he did not exist, that gave him ideas, finally his home it was a hive city. In all honesty the one who created it had the right idea, the people would be slaves to the government, and the government slaves to the people.
Ultimately Sinestro had made two massive errors, the first only one hive city; the people needed to spread, grow increase this one massive city limited this people's potential.
The second; they had no outer world colonies, what would happen should they be attacked and the planet fell. Ultimately it would be the end of the species, he planned to change that.
The woman that gave birth to him, had proven her people worthy of his teachings-along with his protection. Eventually they would join Humanity, and cross breed if any Xenos were encountered they would be brought into the new Imperium.
However the most pure ones of the species, would be guarded. It was ultimately them that held the original seeds of their genes. And just like that ten years passed, while he planed.
Deep within the universe an entity stirs, a being that should not exist has come, bringing forth change both good and evil. challenging the written laws and it had awoken to meet the challenge.