From the records of the experiences of predecessors in the Earth Immortal Mansion and Yue Xian Mansion that Su Yu reviewed, the differentiation in the Mark of the Great Path in the Dividing Spirit Realm is determined by how deeply the mark is engraved into the Great Dao.
If one were to consider the Great Dao as a long river, then merely touching the edge of this river corresponds to the weakest layer of the Mark of the Great Path.
Such cultivators, who attain the Dividing Spirit Realm in this way, possess the lowest strength and foundation.
From the scriptures in the Yueshen Mansion Wanshu Building, ancient cultivators categorized the Mark of the Great Path in the Dividing Spirit Realm into four levels.
Entry, Lesser Vehicle, Mahayana, and Extreme Boundary.
As for the difference in perception between the Mark of the Great Path and the Tao Domain...
"Boom!"