Most crucially, the Witch Clan would not simply watch them gather Stellar Origin, slay the Star Lord, and complete the formation.
Once a Star Lord fell and caused a phenomenon, if the Witch Clan caught even the slightest trace, the Twelve Ancestral Witches would certainly intervene to stop them. They might even take the opportunity to kill them.
In addition, he had originally planned to form an alliance with Dongwang Gong to resist the Witch Clan together.
Although the Twelve Ancestral Witches' injuries were not light, they would fully recover in at most a few dozen Epochs. If they were willing to pay a price, the time required could be shortened even further.
As for breaking through to the Late-Stage Primordial Golden Immortal realm, before the Witch Clan joined the struggle for supremacy in the Primordial World, it might have taken several hundred Epochs.
But now that the Witch Clan occupied the Central Continent and Eastern Continent, with Fortune soaring to the heavens and Immeasurable Fortune supporting them, they would likely break through in no more than two hundred Epochs.
With only two hundred Epochs, he likely would not have enough time to resolve every problem and deduce and establish the formation he envisioned.
What if he did not cooperate with Dongwang Gong? What if he hid in the shadows until he had deduced and established his envisioned formation, then fought the Witch Clan to the death?
It was not that he had not considered it, but after pondering it for a moment, he still abandoned the idea.
If that happened, Dongwang Gong certainly would not be able to contend against the Witch Clan and would be easily destroyed.
Once Dongwang Gong was destroyed, the Witch Clan could seize the Four Seas and send troops to occupy the Southern Continent.