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What if the Germans anticipated an Italian fiasco in North Africa and had a fully equipped panzer corps ready to go near the Italian border. In addition what if they had the prudence to have updated a significant number of panzers with long barrel guns?
I think the Germans could have come to the decision to improve gun performance prior to the invasion of France. I certainly think they should have decided to do so urgently after the experience of that campaign.
Although operations in North Africa were mostly constrained by logistics, I think a full enhanced panzer corps at the right time could have overcome British opposition in Egypt.
What would happen after that is another aspect of the discussion.