I see all the Messengers are part of the One Holy Spirit CG. They all exist in the Spiritual World.
I imagine them as the Suns of creation. Every Sun we see in this reality, is a reflection of the Messengers of God.
I have previously offered this from Abdul'baha, have a read and you may see what I am thinking.
Tablet of the Universe (Lawh-i-Aflákiyyih)
Regards Tony
Here's the first three paragraphs of about 28...
Praise be to God Who hath ever caused His Names and Attributes to penetrate the degrees of existence; Who hath made the effects of those Names and Attributes to shine resplendent and their signs to be firmly established in both the hidden and manifest worlds. By them He hath made the holy realities that are informed by His grace and are the recipients of His outpourings to be the sole revealers of all that pertaineth unto Him, and hath caused them to move through the firmament of perfection in arcs of descent and ascent. He hath ordained these Names and Attributes to be the first and foremost origin and cause of being in the world of creation and the source of the different grades of realities in the degrees of existence. When, through its power of attraction and propagation, the Day-Star of Names and Attributes shone upon the hidden realities in the heart of the unseen realm, they issued forth, were spread abroad, scattered about, set in order, became the recipients of the grace of God and His outpourings, and were made to be the sole manifestations of the Divine conditions and Eternal signs. Emerging from behind the veils, they appeared clothed in raiments of light, moving in the firmament of the unity of God, in orbits of sanctity and circles of glorification.
Thus the suns of the praise of the one true God moved resplendent in a vast, infinite space, capable neither of being defined by limits nor contained within the compass of signs and allusions. All praise be to Him Who was its Author and Creator, Who spread it out, and adorned it with countless lamps and never-fading luminaries: 'None knoweth the hosts of thy Lord save Him' (Qur'an, 74:31). He made the circuits of these luminous divine orbs to be their lofty and celestial spheres; and He made the bodies of these spiritual spheres to be subtle and soft, flowing and liquid, undulating and vibrating, in such manner that these refulgent orbs swim in the circumferences of the spheres, and move in their vast space by the aid of their Creator and Maker, their Ordainer and Fashioner.
Divine and all-encompassing Wisdom hath ordained that motion be an inseparable concomitant of existence, whether inherently or accidentally, spiritually or materially. This movement must be governed by some check or rein, some regulator or director, otherwise order will be disrupted and the spheres and bodies will fall from the heavens. For this reason God brought into being a universal attractive force between these bodies to hold sway over them and govern them, a force deriving from the firm ties, the mighty correspondence and affinity that exist between the realities of these limitless worlds. By the operation of this attractive force those holy and resplendent suns, with their luminous worlds, satellites and planets, circling and orbiting in their heavens, at once exerted attraction and were subject to it, induced motion and were themselves moved, began orbiting and set into orbit other bodies, shone forth and caused others to shine. In this manner they became arranged in a perfectly ordered system, each one a handiwork of consummate fashioning and manifest beauty, each one an enduring creation and a conclusive proof. Glory be to Him Who attracted them, laid firm hold on them, imbued them with effulgence, ordered them and set them in motion; and far from His glory be that which any of his creatures can affirm of Him or attribute to Him.
That's a lot of words. Do you have something that is more to the point? I don't think Abraham and Moses... or Adam and Noah, were manifestations. I wouldn't be surprised if they weren't even real, historical people. The point of the stories seems to be to get people to believe in a creator God and obey his rules. I can see why some Jews would believe these stories as true, even some Christians. But Baha'is don't take the stories as true, yet... they make some of the characters in those stories manifestations of God?
Like I said, the only reason I can is to support the Baha'i belief in progressive revelation. Which is fine for Baha'is, but I don't believe it. Again, people making up Gods and religions seems much more likely to me. And that eliminates any need to try and reconcile the differences and contradictions. Hindus can have their many Gods and incarnations and reincarnation. And Christianity can have their dying and rising savior God/man.