The Dogon The descendants of Egyptians?

The precise origin of the Dogon, like those of many other ancient cultures, is undetermined. Their civilization emerged, in much the same manner as ancient Sumer, both sharing tales of their creation by gods who came from the sky in space ships, who allegedly will return one day.

The early histories are informed by oral traditions that differ according to the Dogon clan being consulted and archaeological excavation much more of which needs to be conducted.

Because of these inexact and incomplete sources, there are a number of different versions of the Dogon's origin myths as well as differing accounts of how they got from their ancestral homelands to the Bandiagara region. The people call themselves 'Dogon' or 'Dogom', but in the older literature they are most often called 'Habe', a Fulbe word meaning 'stranger' or 'pagan'.

Allegedly, when the Dogon left Egypt, they brought with them sacred knowledge in the form of oral traditions, perhaps handed down by the ancient priests of Egypt.

The Dogon creational tale is laced with metaphors that are similar to other legends of creation throughout the world. One need only compare them and understand their metaphoric content, to understand the nature of our reality, past, present, and future.

According to Dogon mythology, Nommo was the first living being created by Amma, the sky god and creator of the universe.

He soon multiplied to become six pairs of twins. [This is a metaphor for one source/soul splitting into two - yin /yang, when it enters into the electromagnetic energies of third dimension. See Tween flames.

One twin rebelled against the order established by Amma, thereby destabilizing the universe. [The focus in our duality has always been to restore balance, through healing, especially as many myths foretell that at the end of time there will be a judgement day.]

In order to purify the cosmos and restore its order, Amma sacrificed another of the Nommo, whose body was cut up and scattered throughout the universe. This distribution of the parts of the Nommo's body is seen as the source for the proliferation of Binu shrines throughout the Dogon region. (This is similar to the story of Isis- Osiris and Horus

Astronomy

The Dogon are famous for their astronomical knowledge taught through oral tradition, dating back thousands of years, referencing the star system, Sirius is the dog star. It is linked with the Egyptian goddess Isis. The astronomical information known by the Dogon since that time, was not discovered and verified until the 19th and 20th centuries, making one wonder how the Dogon came by this knowledge. Their oral traditions say it was given to them by the Nommo. The source of their information may date back to the time of the ancient Egyptian priests.

I would say that it is very unlikely at best. Why would the Egyptians leave behind the lush banks of the Nile, to traverse 4000 Km of the harshest environment on Earth and finally settle in a remote area of Mali? To my knowledge, there are no linguistic connections that would show the Dogon language to be derived from Egyptian. Nor is the Dogon religion similar to the Egyptian one. The creation story in your post is actually quite different from the Egyptian myth of Osiris, where Osiris was killed by his brother and resurrected by his sister. The only part that's similar is the idea of the body being cut up in pieces; but then again this is a common enough theme: see the Babylonian myth of Tiamak being cut up by Marduk, or the Chinese myth of Pangu's body parts becoming parts of the Earth.

Also, the whole Sirius B story was later shown to be a hoax perpetrated by a European. There was no ancient knowledge of the double star, only an ambitious adventurer who wanted to make a name for himself by bringing back a fabulous story from a "primitive" people...