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The many incarnations of Homo-sapien
The oldest fossil attributed to the genus Homo is 2.8m y/o, but there is such little evidence available to consider them the first human.
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Homo Habilis is considered the first human, who evolved around 2.5m y/ago.
Homo Rudolfensis evolved around 2.1m y/ago, but is not a direct human ancestor, so is an off-shoot from H Habilis on the human line.
Homo Ergaster evolved around 2m y/ago, a sub-species of H Erectus along with 8 other sub-species, first to leave Africa and spread around the world.
Homo Antecessor evolved around 1.2m y/ago in Western Europe, an evolutionary offshoot that disappeared around 800,000 y/ago.
Homo Erectus Heidelbergensis evolved around 600,000 y/ago in Europe and are the ancestors of the Neanderthals, first to have had true language.
Homo Bodoensis the main Hominin of Africa evolved around 600,000 y/ago, different to H Heidelbergensis and considered to be our only main direct ancestor who was very advanced for that time.
Homo Neanderthalensis evolved around 430,000 y/ago in Europe, had bigger brains and were making much more complex technology than H Sapiens.
Homo Sapiens evolved around 300,000 y/ago in SE Africa and started leaving Africa around 100,000 y/ago.
Homo Naledi evolved around 335,000 y/ago in S Africa and it’s seemingly primitive features means it either branched off early from H Habilis or is a result of Australopithecines mating with early Homo.
Denisovans evolved around 300,000 y/ago and were very similar to Neanderthals and roamed most of Asia and deep into SE-Asia and likely descended from Asian H Erectus.
Homo Longi evolved around 309,000 y/ago but may be Denisovans, but regardless both are more similar to Neanderthals than to modern humans and may have even had a recent common ancestor with Neanderthalensis around 500,000 y/ago.
Homo Floresiensis evolved around 190,000 y/ago in SE-Asia, tiny but quite intelligent, thought to have evolved from H Erectus around 1m y/ago.
Homo Luzonensis evolved around 750,000 y/ago in the Philippines, their ancestors were likely H Erectus.
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Why does anthropology concentrate on Neanderthal admixture, when there are so many other admixed peoples that are/look/behave distinctly-different from the norm.
…such as this guy 
…this chick
…and these people
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I, personally, think that much more interbreeding/ad-mixing went on/occurred, as One can tell that it did just by looking at the array of differing living physical-phenotypes… which is what differentiates one sub-clade from the anatomically-different next, as the below ‘issues’ explains.
