I think the real key was Prussia
Hitler would not come to power without abolishing of legal Prussian government of "the lion" Otto Braun. Prussia was not Nazi stronghold, and was the biggest state of the Reich (look at the map and statistics).
You not going to rule Reich without Prussia!
That's what was so ironic about the Allies "abolishing" Prussia after the war. Prussia had been the center of opposition to Hitler and was by far the most democratic and best-run part of the Weimar Republic! And once Hitler snuffed out his left-opposition, the remaining opposition to Hitler in the army, came from conservative but anti-Nazi Prussian Junkers.
