If he didn't reach dao actualisation peak stage, Ye Mo would think to enter the demon realm and ask about the abyssal realm. He wouldn't dare to go to the Void Marketplace.
But now, the first place Ye Mo wanted to go was the Void Marketplace. With his current cultivation level and power, there was no doubt he could kill dao essence.
Through his enlightenment he learned the difference between dao vindication second step and third step.
The third step was primordial essence. Primordial essence masters can easily tear open void. Their will was powerful to the extreme. Therefore, Ye Mo was certain that the two powerful beings he saw at the auction weren't primordial essence divine emperors. Their spirit sense was strong but couldn't compare with primordial essence divine emperor. They were at most two half way primordial essence.