The visiting jiva-souls who enter the material creation MUST obtain (hire) a material bodily vessel first from Maha-Visnu's dreams.

Every material bodily vessel in the material creation must be first "hired" from Maha-Visnu who owns them all.

Srila Prabhupada - "We are not the owner of this body, not the owner of the senses. The senses are "hired" from the Supreme Lord. This is very subtle understanding, one should know the proprietor of the senses is God." (March 1966 NY City USA)

Each individual jiva-soul in the spiritual world can "choose" to "voluntarily" serve Krsna in an unlimited variety of ways as an unlimited varieties of bodily forms, or even reject Krsna if they choose and enter or return to the impermanent material world.

In the material world, each material bodily vessel is always available for "hire" to the jiva-souls, and are continuously available to all visiting jiva-souls who also choose to enter the temporary decaying material creation.

The REAL home of the jiva-souls is always in either the Vaikuntha planets of Lord Visnu, or Krsna's central planet of Goloka-Vrindavana and NOT the temporary mundane material creation, or merged inactively (dormant) in the impersonal Brahmajyoti.

From Maha-Visnu's point of view, the movement through material time's past, present and future all exist simultaneously, and is always there as a "permanent pathway" that unlimited jiva-souls are continuously moving through.

Srila Prabhupada – “This material creation is the spirit soul’s dream. Actually all existence in the material world is a dream of Maha-Visnu, as the Brahma-Samhita describes- 

“This material world is created by the dreaming of Maha-Visnu. The real, factual platform is the spiritual world, but when the spirit soul wants to imitate the Supreme Personality of Godhead, he is put into this dreamland of material creation." (SB, Canto 4 Ch 29 Text 83)

Srila Prabhupada – “Everything happening within time, which consists of past, present and future, is merely a dream. This is the secret in understanding in all the Vedic literature.” (SB, Canto 4 Ch 29 text 2b)

Srila Prabhupada – “Our contact with matter is just like dream. Actually we are not fallen. Therefore, because we are not fallen, at any moment we can revive our Krsna consciousness, we break the dream.” (Tokyo Japan 1972 lecture on SB)

Srila Prabhupada – “Factually all of material existence is only a dream. Thus there is no question of past, present or future. Persons who are addicted to karma-kanda-vicara, which means ‘working for future happiness through fruitive activities’, are also dreaming. Similarly, past happiness and present happiness are merely dreams.” (SB, Canto 4 Ch 29 text 2b)

Each material bodily "pathway" that the visiting jiva-soul travels on, comes from the already "dreamed" dreams of Maha-Visnu. 

Srila Prabhupada - "The spirit soul unfortunately misuses this God-given minute free will and falls into the dark well of nescience and illusion. Once the spirit soul takes shelter of māyā, the illusory material energy, he develops the material qualities of goodness, passion, and ignorance. 

The spirit soul loses his original characteristics and develops a new nature, which is controlled by the three modes of material nature. 

And this continues until such time as he transcends them. His actions are prompted accordingly. 

If it happened in any other way, then material variegatedness would not be visible in this phenomenal world. So, if a person fails to inform himself about the very subtle laws and workings of material nature, and at the same time he argues that all activities are sanctioned and inspired by the Supreme Lord, then he is reducing the Supreme Lord's position and making Him out to be partial and unjust. 

The Lord never favors one and discriminates against another. Factually, He advises everyone to give up all material activities, which are by nature unstable and temporary. Because of forgetfulness of God, a man becomes an eternal victim of ignorance, which then colours all his actions." (Renunciation Through Wisdom 1.9)

Within Maha-Visnu's material creation exists every possible "dream" to fulfil every desire the visiting jiva-souls have, every scenario they can come up with is eternally existing in Maha-Visnu's dreams.  

This means the jiva-soul's ability to express "free will" is already factored into the equation of the destiny of each material bodily vessel.

Bhagavad-gītā As It Is - "O Arjuna, whatever you wish to see, behold at once in this body of Mine! This universal form can show you whatever you now desire to see and whatever you may want to see in the future. Everything moving and nonmoving is here completely, in one place."(BG As It Is, Translation Ch 11 Text 7) 

Srila Prabhupada - "No one can see the entire universe while sitting in one place. Even the most advanced scientist cannot see what is going on in other parts of the universe. But a devotee like Arjuna can see everything that exists in any part of the universe. Kṛṣṇa gives him the power to see anything he wants to see, past, present and future. Thus by the mercy of Kṛṣṇa, Arjuna is able to see EVERYTHING!" (BG As It Is, Purport Ch 11 Text 7)**