Are all nine of the Manifestations of God (Abraham, Krishna, Zoroaster, Moses, Buddha, Jesus Christ, Muhammad, Báb and Bahá’u’lláh) in Heaven as individual people ?
Good questions!
There are or have been Manifestations of God we don’t know about the Ones you’ve listed are the Ones we know about…
I’ve posted this source below before and it is in my view one of the best essays on the subject!
The Manifestations have three aspects … physical, human and Divine…See the following:
This spiritual reality, the First Emanation of the Divine Reality, is reflected in the human reality of these personages, like the sun is reflected in a perfect mirror. They are therefore characterized by a threefold reality:
Material: that is, their bodies, which – like all human bodies – are bound to be born, to grow up, to develop and to die.
Human: that is, their souls, their individualities. In this regard Bahá’u’lláh writes:
Everyone of them is a mirror of God... All else besides them are to be regarded as mirrors capable of reflecting the glory of these Manifestations Who are themselves the Primary Mirrors of the Divine Being...'. He writes moreover that the soul of the Manifestation of God is a pure and stainless Soul’99 and
Abdu'l-Bahá explains that it is a perfect soul’, `like a mirror wherein the Sun of Reality is reflected… a perfect expression of the Sun’.[10]
When the soul of the Manifestation is compared to God, it is like a perfect mirror reflecting the divine rays; when it is compared to mankind, that soul occupies a quite different position.
Abdu'l-Bahá says: … the individual reality of the Manifestation of God is a holy reality, and for that reason it is sanctified and, in that which concerns its nature and quality, is distinguished from all other things…’.[11]
In this context, He likens this perfect Soul to the sun, which is the direct source of its shining rays, and human souls to the moon, which merely reflects those rays.
These souls are different from human souls also in another respect: `The Prophets are pre-existent. The soul or spirit of the individual comes into being with the conception of the physical body. The Prophets, unlike us, are pre-existent. The soul of Christ existed in the spiritual world before His birth in this world. We cannot imagine what that world is like, so words are inadequate to picture His state of being…’.[12]
Also the Manifestations of God have a
rational soul, which is the human reality', or human spirit’, says
Abdu'l-Bahá, and they … share it with all mankind’. However, He explains that the degree of perception typical of the Manifestations of God is not the same rational perception which is typical of human souls, but a
universal divine mind' transcending human knowledge, in that it is a conscious power, not a power of investigation and of research’. Such power `is the special attribute of the Holy Manifestations and of the Dawning-Places of Prophethood; a ray of this light falls upon the mirrors of the hearts of the righteous’.[13]
Therefore human knowledge is but the reflection of a ray, when compared to such a sun as is the knowledge of the Manifestation of God.
Moreover, in the station of their individualities
the Divine Manifestations are so many different mirrors, because they have a special individuality... It is clear that the reality of Christ is different from that of Moses.' Nevertheless that which is reflected in the mirrors is the one sun’,[14] therefore it is easy to understand how, though the Manifestations of God differ from each other in many respects, yet they are essentially one and the same.
Divine: that is the Word of God, the Logos. This reality has neither a beginning nor an end; it is eternal, yet it is inferior to God, because it was created by Him.
... this third state is alone partaken of by the divine messengers, although great saints have attained extraordinary pre-eminence and reflect the splendour of the sun,'[15] says Abdu’l-Bahá.
These three aspects of the reality of the Manifestation of God are described by `Abdu’l-Bahá through the following metaphor: their material nature is as a niche, their human nature is as the lamp within the niche, their divine nature as the light which emanates from the lamp.[16]
bahai-library.com/books/quest/quest.06.html