Devotee: His Divine Grace Śrīla Bhaktisiddhānta Sarasvatī accepted both Śrīla Bhaktivinoda Ṭhākura and Śrīla Gaurakiśora as his spiritual master.
Prabhupāda: Gaurakiśora dasa . . . Bhaktivinoda Ṭhākura was his father, and Gaurakiśora dāsa Bābājī was treating Bhaktivinoda Ṭhākura . . . Although he was householder and Gaurakiśora dāsa Bābājī was renounced order, still, he used to offer great respect to Bhaktivinoda Ṭhākura, and Bhaktivinoda Ṭhākura saw him a pure devotee; therefore he recommended his son, Bimala Prasāda. His former name was Bimala Prasāda, and he got this title Siddhānta Sarasvatī by writing one thesis on astronomy, astrology, astrological calculation according to solar system. So he got this title Siddhānta Sarasvatī.
So this Siddhānta Sarasvatī, Sarasvatī title also accepted by sannyāsa. Sarasvatī, Bhāratī, Puri, Araṇya, Bon, Parvat—there are ten names of sannyāsa according to Māyāvādī school, and according to Vaiṣṇava school there are 108 names. So this "svāmī" and "gosvāmī," they're also included within that 108 names. So he accepted Gaurakiśora dāsa Bābājī Maharaja his spiritual master.
Devotee (2): Does our line of succession go directly to Gaurakiśora dāsa Bābājī or to Bhaktivinoda Ṭhākura?
Prabhupāda: No. Because he was treating Bhaktivinoda Ṭhākura as his śikṣa guru, preceptor guru, so it is in the line.
Devotee (2): But is Bhaktivinoda Ṭhākura directly in succession from Lord Caitanya?
Devotee (2): And Gaurakiśora dāsa Bābājī also?Prabhupāda: Yes.