By remaining in Kamsa's association, they (some of the chief devotees, such as Akrura) would be able to see the SPofG take birth and display His childhood pastimes, and Akrura would later go to Vrndavana to bring Krsna and Balarama to Mathura

Expressions researched:
"By remaining in Kaṁsa's association, they would be able to see the Supreme Personality of Godhead take birth and display His childhood pastimes, and Akrūra would later go to Vṛndāvana to bring Kṛṣṇa and Balarāma to Mathurā"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

By remaining in Kaṁsa's association, they would be able to see the Supreme Personality of Godhead take birth and display His childhood pastimes, and Akrūra would later go to Vṛndāvana to bring Kṛṣṇa and Balarāma to Mathurā. The word paryupāsate is significant because it indicates that some devotees wanted to stay near Kaṁsa in order to see all these pastimes of the Lord.

SB 10.2.4-5, Translation and Purport

Some of their relatives, however, began to follow Kaṁsa's principles and act in his service. After Kaṁsa, the son of Ugrasena, killed the six sons of Devakī, a plenary portion of Kṛṣṇa entered her womb as her seventh child, arousing her pleasure and her lamentation. That plenary portion is celebrated by great sages as Ananta, who belongs to Kṛṣṇa's second quadruple expansion.

Some of the chief devotees, such as Akrūra, stayed with Kaṁsa to satisfy him. This they did for various purposes. They all expected the Supreme Personality of Godhead to appear as the eighth child as soon as Devakī's other children were killed by Kaṁsa, and they were eagerly awaiting His appearance. By remaining in Kaṁsa's association, they would be able to see the Supreme Personality of Godhead take birth and display His childhood pastimes, and Akrūra would later go to Vṛndāvana to bring Kṛṣṇa and Balarāma to Mathurā. The word paryupāsate is significant because it indicates that some devotees wanted to stay near Kaṁsa in order to see all these pastimes of the Lord. The six children killed by Kaṁsa had formerly been sons of Marīci, but because of having been cursed by a brāhmaṇa, they were obliged to take birth as grandsons of Hiraṇyakaśipu. Kaṁsa had taken birth as Kālanemi, and now he was obliged to kill his own sons. This was a mystery. As soon as the sons of Devakī were killed, they would return to their original place. The devotees wanted to see this also. Generally speaking, no one kills his own nephews, but Kaṁsa was so cruel that he did so without hesitation. Ananta, Saṅkarṣaṇa, belongs to the second catur-vyūha, or quadruple expansion. This is the opinion of experienced commentators.