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The reason for stating the basis of the substances is that space is greater than that substance. The substance of inherent properties, along with the four substances, does not exist throughout the entire space. It is located only in certain finite regions of space. The portion of space in which it is located is called a 'ten'. However, the meaning is that there are five substances. Outside of this region, infinite space is present all around; since there is no location of other substances in it, it is called 'unoccupied'. Here, the relationship between the substances of the universe should be understood solely in terms of the local space.
Both dharma and adharma are such that they are immutable substances that are only stable in the complete space. This matter can be stated differently as well. In fact, even the concept of unbroken space is understood in two parts, named 'lek' and 'alek', which arise from the relationship of dharma and adharma substances. Where there is no relationship of these substances is called 'alek', and where there is a relationship is 'lek'.
The basis of pudgala substances is generally determined by space. Nevertheless, specifically, there are differences in the dimensions of the supporting fields of various pudgala substances. A pudgala substance, unlike some dharma or adharma substances, is not merely one entity such that there can be a uniform supporting field for it. Due to differing individuals, there is diversity in the dimensions of pudgala; there is no uniformity. Therefore, here it is.