Historically Karl Saur served as Speer's deputy in the Ministry of Armaments and in the Organisation Todt. At the end of 1944, he increasingly turned away from Speer, whose star was falling, and was in cohorts with Bormann and Goebbels, who had by then turned away from his initial plan of aligning
himself with Himmler and Speer against Bormann.
Another potential candidate would be SS-Obergruppenführer Dr. Hans Kammler, a high-ranking official in the SS Economics and Administrative Central Office, with whom Speer collaborated in establishing underground
factories ran by slave labour and who later headed the programme responsible for building the V2 missiles.