Regarding your two questions, the first, Sri Gadadhara is expansion Radharani and Srinivasa is the expansion of Narada Muni, or in other words they are the internal and the devotional energy respectively. The second question, Yes, Rupa Goswami is a Gopi by the name of Rupamanjari, but not all the six Goswamis of Vrndavana are Gopis. The following is a list of some of the principle Gopis, the first eight are called Astasakhi:
- 1. Lalita
- 2. Visakha
- 3. Sucitra
- 4. Campaklata
- 5. Rangadevi
- 6. Sudevi
- 7. Tungavidya
- 8. Indurekha
- 9. Rupamanjari
- 10. Ratimanjari
- 11. Labangamanjari
- 12. Rasamanjari
- 13. Manjumali
- 14. Kasturika
etc. You can sing individually the names of the Gopis, there is no harm, but when we sing the prayer "Sri radha krsna padan sahaguna lalita sri visakhan vitams ca" this includes them all.