Its a great read. Stolfi acknowledges that it still might have come up a bit short -- the logistics/tank recovery teams might have pulled it off but it would've been close. But Guderian was correct and OKH and Hitler wrong. They needed to have kept up the skeer and didn't. That was the one chance for victory.
'damascus:
Had the USA never been involved in Europe aside from the Lend Lease we supplied before the end of 1942, Germany would still have lost. After the last quarter of 1941, The USSR could have beaten them even had England sued for peace. Stalin and Beria were willing to kill 40 million Russians to win -- say what you will about them being monsters, you cannot fault their resolve -- and Germany never had the wherewithal to land a killing blow after the first Winter. Absent the USA and absent Britain, the USSR may not have won until 1949 or 1950, but eventually they would have. Like Gelcube notes above, the economics of the thing meant that anything that didn't result in a decisive win for Germany in the opening year translated as an eventual -- however Pyrrhic -- victory for the CCCP.
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