In OTL, the Axis powers traded troops for their priority fronts. What if they had been more specialized, with Italian reinforcements substituting for the Afrika Korps and German (and other minor Axis allies) troops substituting for Italians on the Russian front. What is the result in each place, and if each power mans its front by itself with its maximal force, is that an even trade in terms of quantity? Is it an even trade in terms of quality? Campaign outcomes?