OKW doesn't have a early game firepower advantage at all.
Theory crafting. OKW early game depends on the map. Close quarter battles and narrow pathways create great opportunities for OKW to set up Kubels and Sturms. Even in early game, Jesulin did great job holding off Rifle spam in his latest Propagandacast replay. Cons a little tricky as they can get AT grenades, but by that time you should have 1 cp for MG and or 2-3 squads of Volks. You make it seem like Cons spam and Rifle spam works against OKW 90% of the time.