In अभ्यास 3 of Lesson 9 of Gita Sopanam (Level - 1), अहं सर्वस्य प्रभवः, there have been quoted several declarations made by श्री भगवान् such as:
अहम् आदित्यानां विष्णुः |
अहं पाण्डवानां धनञ्जय: | etc.
I am unable to understand how the षष्टी विभक्ति fits in here. As far as my understanding is (and I know I am wrong), षष्टी is used to convey possession. But there is no possession being implied here. Rather, what श्री भगवान् is saying in the above sentences is "AMONG the Adityas, I am Vishnu," and "AMONG the Pandavas, I am Dhananjaya".
And my little (mis)understanding of vibhaktis says that सप्तमी विभक्ति could be relevant here (since IN, and/or AMONG are placed in सप्तमी).
So, is it wrong to say "अहम् आदित्येषु विष्णुः|" or "अहं पाण्डवेषु धनञ्जय:।" ?
Thanks in advance