In our timeline, the Nazi obsession with Lebensraum (living space) began with Rudolf Hess, who was a student of Karl Hanhofer, who postulated the idea of Germany expanding East to gain more territory to create settler colonies.
So if for some reason, Rudolf Hess never joined the Nazi Party or if Karl Hanhofer was never born, what happens to the idea of Lebensraum? Does it still become a pillar of Nazi ideology? If it doesn't, how does the absence of this idea affect the development of National Socialism?