>>17945766
>1/4 of the invading force was non-german
Regular infantry guarding quiet sections of the line or supply lines, many not even front line troops, neither Italy nor Romania had state of the art armored divisions like Germany. It is meaningless to say "oh, look at the number of countries were involved" without further context.
>90% of lend lease arrived after 1943-1944
Does this imply the prior 10% was irrelevant?
>1941
Operation Barbarossa itself was a rushed effort, unlike the invasion of France which the German military had been planning for years, the Germans had not winterproofed their machinery and did not bother to even provide winter clothing for the troops, it is unlikely they would have. 1942 was a more pivotal year and by then there were receiving ample lend lease starting with the UK, there were Matildas fighting in the Ukraine by summer 1942, for example.
This does not diminish the efforts of Russia and their allies, but you do not win a war by will alone, in the brutal darwinian world in which we live you also need aviation fuel, ball bearings and Studebaker trucks.