Nothing wrong with that Tim.

Neanderthal & Denisovian genes are widespread still around the world.
Neanderthal genes are still found mostly around European/Middle-Eastern regions.
Denisovian genes are found throughout Asia, through the older peoples of the America's and quite commonly via Melanesia.

There was also an 'African' version of an isolated gene pool (Race X) that eventually got over-taken by the Sapiens moving into the rest of Africa.

All three are long gone in any substantial way, but their genes are still randomly popping up in their own little way.

When the Sapiens crawled out of the 'crack' (Rift Valley) of Mother Earth, they entered a world that was still covered with the Neanderthals, Denisovians & Race X'ers.
Also, the early Hominids were still in existence as far as Indonesia.
So you could say there was a world where all 'three' waves existed at once.
1st Wave: Hominids
2nd Wave: Neanderthals, Denisovians, Race X
3rd Wave: Sapiens

It's just like the roles in the family.
The youngest sibling is the traditional 'breeder' over the other two  .

Who knows, maybe 'Heaven' was in the past.
And we are falling further into Hell?