Yogindu and Kunda-kunda equates Atman with Parmatman. The separateness and individuality of a Jiva is only from the point of view of Vyavahara or experience. Plurality of souls is a relative conception - which reality presents when we lay stress on sensations, feelings and bondage. There is no need to deny plurality of the Jivas at the psychological level. But in Philosophy, Psychological and practical levels are not all.
Logic is the hard task-master.
Pluralism and Relativism are the two features of a first analysis of common experience and Jainism stops short of it, disregarding its implications. Plurality may be existence or actual. But it is not real. Similarly infinite is inherent in the finite. We cannot substain the hypothesis of relativism without an absolute.