Genesis vs. Death

No, they didn't!  They just called themselves Death.  Not that it really matters in a way because Mantas, Chuck's earlier band, was already making death metal in the year of, um, Kill em all. I understand that people who don't like death metal believe that Death started the genre just as people who don't like thrash metal love to claim Metallica made the first thrash metal album but it is not the truth.  At any rate, Scream Bloody Gore has not much more in common with what eventually came to be death metal (which would not come into being before Terrorizer/Morbid Angel) than did early Kreator or Sepultura.  In effect, they are to death metal what Genesis were to symph prog - not the first but essential and influential prime movers.  They didn't even lead the way in technical metal but again were amongst those who made it an important niche of metal. 

I must also point out that death metal is just a sub genre within metal, it is simply not a "whole new genre" by any means and most of the elements that go to defining it had been put together in closely related genres like thrash metal and grindcore.  All it did was to establish a narrow aspect of differentiation within metal music and typically metal fans felt the need to call it something else -  a trend which got even more bizarre from the 90s onwards but that's another story. Rock taxonomy is in any case a confused, whimsical and subjective business with precious little basis in objective aspects of music so it says next to nothing about how innovative a band is. Neo prog was used as more of an historical term to describe prog rock bands of the 80s but the style had been laid out by four man Genesis as also And Then There Were Three along with some other bands.