Both the brothers, Rupa Gosvami, Sanatana Gosvami, they became gosvamis. And other gosvamis, Gopala Bhatta Gosvami, Raghunatha dasa Gosvami, Sri Jiva Gosvami, they became their assistants

Expressions researched:
"both the brothers, Rūpa Gosvāmī, Sanātana Gosvāmī, they became gosvāmī. And other gosvāmīs, Gopāla Bhaṭṭa Gosvāmī, Raghunātha dāsa Gosvāmī, Śrī Jīva Gosvāmī, they became their assistants"

Srimad-Bhagavatam Lectures

In the beginning, when he was a minister, Rūpa Gosvāmī was not a gosvāmī, but later on, when he became completely educated by Śrī, Śrīla Mahāprabhu, Caitanya Mahāprabhu, both the brothers, Rūpa Gosvāmī, Sanātana Gosvāmī, they became gosvāmīs. And other gosvāmīs, Gopāla Bhaṭṭa Gosvāmī, Raghunātha dāsa Gosvāmī, Śrī Jīva Gosvāmī, they became their assistants.

Lecture on SB 1.2.19 -- Vrndavana, October 30, 1972:

So in spite of becoming a brāhmin, qualified, śāstra says, ṣaṭ-karma-nipuṇo vipro mantra-tantra-viśāradaḥ. A brāhmin, he is expert in his occupational duties. Ṣaṭ-karma means paṭhana-pāṭhana yajana-yājana, six kinds of occupational duties. But avaiṣṇava-mukhodgīrṇa, uh . . . yes:

ṣaṭ-karma-nipuṇo vipro

mantra-tantra-viśāradaḥ

avaiṣṇavo gurur na sa syād

vaiṣṇavaḥ śva-paco guruḥ

(Padma Purāṇa)

This is the injunction of the śāstra. In spite of his good qualification, expert in six occupational duties of a brāhmin, if he's an avaiṣṇava, if he has not understood Kṛṣṇa or Viṣṇu, the Supreme Personality of Godhead, then he cannot become guru. Therefore, according to Vedic system, not a brāhmin is accepted as guru, but when he becomes gosvāmī. Gosvāmī means fully controlled in full knowledge of Kṛṣṇa consciousness. He can become guru.

The . . . Rūpa Gosvāmī's, the . . . that six kinds of control. One who has controlled over his speeches, over his anger, over his tongue, over his mind, over his genital, over his belly, when one has full control over these six things, he's gosvāmī. Pṛthivīṁ sa śiṣyāt (NOI 1). He can make disciples all over the world. That is the injunction of Śrī Rūpa Gosvāmī. He was himself gosvāmī.

In the beginning, when he was a minister, he was not gosvāmī, but later on, when he became completely educated by Śrī . . . Śrīla Mahāprabhu, Caitanya Mahāprabhu, both the brothers, Rūpa Gosvāmī, Sanātana Gosvāmī, they became gosvāmī. And other gosvāmīs, Gopāla Bhaṭṭa Gosvāmī, Raghunātha dāsa Gosvāmī, Śrī Jīva Gosvāmī, they became their assistants.

This Vṛndāvana, the present Vṛndāvana, is the excavation of the six Gosvāmīs. This place where we are sitting, here the six Gosvāmīs used to assemble daily for discussing on Bhāgavata. Especially it . . . it is the place of Śrīla Jīva Gosvāmī, Sanātana Gosvāmī's and Rūpa Gosvāmī's nephew.