>>>Were the Germans not expert on the concept of Blitzkrieg? Did not the OKW experts strongly advocate a drive towards Moscow? Were they correct?
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>>IMO They where wrong.
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>>They should have driven south and cut Russia off from her oil and grain supplies (and gained them for themselves)
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>They tried it in 1942. Obviously, it is debatable what could happen in 1941 if Germans would take different plans, but, realistically, this speculation just plays in hand with an idea that USA participation had some impact.

By the time they tried in 1942 they where already overextended and degraded from the winter 1941 campaign. If their first push had been south there would have been nothing to stop them.