In God Sai Baba there are two components, which merged with each other and also get separated after the death of human body of God Sai Baba. The two components are:
1) God Dattatreya, the energetic incarnation in which unimaginable God exists in merged condition. There is no separation of the external energetic form called Dattatreya at any time in present or future. This is the permanent residential address of unimaginable God.
2) God Sai Baba in which God Dattatreya exists in merged condition. God Dattatreya is inseparable as long as He stays in the external human form called Sai Baba. God Dattatreya can quit human firm after death or even in the life time of human incarnation. God Dattatreya left Parashurama while alive whereas He did not leave the human form till death as in the case of Rama and Krishna.
As long as God Dattatreya exists, the human form is God Dattatreya Himself just like the energetic form of God Dattatreya is the unimaginable God Himself during His stay. Hence, monism of God and human form is as correct as the monism of unimaginable God and energetic form called Dattatreya. But, God Dattatreya leaves the human form for which death is inevitable. Whether God Dattatreya leaves the human body and its soul or leaves the human body alone keeping on His merger with the soul is left to the will of God Dattatreya. This point of separation proves dualism of God Dattatreya and the external human form. After separation, we have the two components separately visible, which are God Dattatreya and the human form. Therefore, dualism is justified.