already the genetic distribution of planet's population is extremely close to each other. even a look at that could easily invalidate such 'pure gene' type of theorizations.
MOST importantly, the bodies yahweh brought was not able to reproduce. they brought the entities in non-reproducable bodies. therefore no genes from these bodies could perpetuate.
the reason why moving from 2d body to 3d body has been too fast in this planet is the genetic manipulation yahweh did.
so in the end all 3d bodies come to being faster due to the manipulation yahweh did. there are no exceptions in the material saying that there was segregation, regionality or the like.
material says that the spirit groups who incarnated on the planet largely didnt mix. not the bodies. this is natural, since spirits prefer to incarnate in groups they are closer to.
this still can be seen, in the cultural groups that separate each other. for example denebians are still a quite closed society, not mixing with others and not culturally opening up much either. (chinese/asian). however even when you look at gene difference in between china and any other region, its totally negligible.
actually, if you look at what manipulations yahweh did, that martian/middle east theory becomes even more nonsense - yahweh modified for better speech, more potential to 'understand' creator, foremost. with alphabets consisting of thousands of letters, words being determined by the stress you put in the same sound strings, spectacular scope and depth of the philosophies that come out of that region (from zen to confucianism) whose explanation of existential secrets are incomparable to the nonsense that is manufactured in middle east, one would say that if any such thing as martians not mixing existed, they had to be from china region.
but they arent. we know they are from deneb.
when you look at middle east, you see incalculable nonsense. bronze age tribal traditions combined with priest/god-king cult ending up in psychopathic 'religions' which do no more than tell people how to live their life per bronze age standards, be brutal to and subdue each other.
since any region outside china is very heavily mixed - especially middle east/europe parts - such a theory could not hold any water. especially in middle east.