Potentially? lol. May be? Homo heidelbergenis is absolutely the direct ancestor of both sapiens and neanderthals. And denisovians as well. Homo hei. was a proto-human species that was supplanted by Homo-sapiens neanderthalis, whites, and which bred into Homo sapiens heidelbergensis to create sub saharan blacks. While the more primitive H. Sapiens heidelbergenis remained in Africa the Neanderthals, Denisovians and the more advanced H Sapiens moved north and interbred. I am not sure you know what "inbreeding" is...but crossbreeding with another species a about as far from inbreeding as you can get. In fact it was probaby the outbreeding that allowed European and Asians to spread around the world and advance science and civilization. The sub saharan Africans could only backcross with the archaic proto-humans who lacked the ability to plan and organize migrations as well.