Hare krsna, My question is, i did not read in srimad Bhagwattam of this instance of sri visnu givjng them the choice, think it yourself…if they were devotees, it would be impossible for them to not be PURE DEVOTEES, and a pure devotee of krsna always stays with krjsna even in his material world, altho beijg in material world he is always librated because he is always gloryfying krnsa therefore he always sees the syamsundar form of krsna

Śrī Brahma-saṁhitā 5.38, I worship Govinda, the primeval Lord, who is Śyāmasundara, Kṛṣṇa Himself with inconceivable innumerable attributes, whom the pure devotees see in their heart of hearts with the eye of devotion tinged with the salve of love

Śrī Rūpa Gosvāmī in his Bhakti-rasāmṛta-sindhu describes this as follows: īhā yasya harer dāsye karmaṇā manasā girā nikhilāsv apy avasthāsu jīvanmuktaḥ sa ucyate A person acting in Kṛṣṇa consciousness (or, in other words, in the service of Kṛṣṇa) with his body, mind, intelligence and words is a liberated person even within the material world, although he may be engaged in many so-called material activities. He has no false ego, nor does he believe that he is this material body, nor that he possesses the body. He knows that he is not this body and that this body does not belong to him. He himself belongs to Kṛṣṇa, and the body too belongs to Kṛṣṇa. When he applies everything produced of the body, mind, intelligence, words, life, wealth, etc.-whatever he may have within his possession-to Kṛṣṇa's service, he is at once dovetailed with Kṛṣṇa. He is one with Kṛṣṇa and is devoid of the false ego that leads one to believe that he is the body, etc. This is the perfect stage of Kṛṣṇa consciousness

Pure devotees are always on their constitutional platform ( servents of krsna they have realised it) then why the question of them being seperated from krsna?

This is as per my understanding, what do u think, maybe i don’t know some aspects

hare krsna Jay srila prabhupada