If there were any other Wizards above Level 3 nearby using Rule Power, with his range of Spiritual Power perception, he would definitely notice.
The only explanation is that the area of the first layer far exceeds everyone's estimation, with random teleportation evenly distributing hundreds of participants over such vast lands, possibly making the distances between them span several kingdoms.
Moreover, since everyone has unanimously chosen to restrain their aura and conceal their movements, the likelihood of encountering one another is further reduced to an almost negligible level.
Duke hasn't rushed to the second layer immediately because he considers there are still many potential resources in the first layer, so there's no need to hurry.
This Path of Divine Revelation has no definite end time; it is essentially to give these potential Divine Seeds the opportunity to grow.
