I don't think Hitler had any problem with the idea that Jews and "Aryans" had a common ancestry. He thought the Jews, Gypsies, Negroes, and other races were inferior and degenerate. He also favored euthanasia to cleanse the gene pool of birth defects and other "undesirable" elements.
I suppose you think Hitler believed in "special creation" of Aryans? You guys need to get over your obsession with Darwin and study the intellectual history of socialism. This is supposed to be a conservative, political forum, after all.