According to Shankara's commentary on Brahma sutras there is no mention of Yoga as such path. Shankara dropped off philosophy of Yoga system. Both paths have basis in Brahmanic rituals but the later one is characterized by transcending rituals (advaita Vedanta). In both paths Unity is possible to reach; in first after total pralaya; in second immediately.
> According to Marshy, the Purusha is totally separate > from the gunas born of nature, prakriti. What is needed > is not a metaphysics, but a PRACTICE, that can be used > to isolate the Purusha from the prakriti: TM is that > effortless technique. Purusha (Atman) can be experienced as if isolated, but real nature of Purusha (Atman) is Brahman, totality. There is no isolation in Brahman state of consciousness. Yoga leads to turya and turyatit (kaivalya), Vedanta leads to Unity of Atman and Brahman.
