imperialscum said: I am not an expert of pre-KOTOR EU but I am pretty sure you are wrong about Sith being biologically pure Sith at the time of Naga Sadow. Sadow was a mix between original Sith and human... as almost all other Sith at that time. I am not sure about this again, but the EU story goes that some exiled Jedi mingled with them thousands of years before. All this was not established in TOR btw. TOR just followed it by simply saying that there were more humans in the Empire (workers, soldiers) than Sith and that the Sith genes were eventually outweighed, therefore majority of imperial look human at that time. So essentially all the imperial humans still have a percentage of Sith genes. What TOR tried to do was connecting all the previously established EU mess to somehow make sense.

The change in the genetic makeup of the Sith had already been explained by Exar Kun and Revan. TOR's Empire just complicates things further.