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The entire premise of this story is that what if German generals were perfect. You can’t question the very basic premise of the story and still expect to enjoy it. That’s like watching Game of thrones and saying dragons can’t exist.
He might be perfect but the rest of the Nazi leadership won't be and will try to prevent him from succeeding too much as they want the glory and the rewards for themselves.
You can make a show about this alternative Hannibal but don't expect me to believe it's realistic
I have in detail told how he defeated the force that was moving to encircle him. And yes, Leningrad can be avoided as the guy who actually actually saved the soviets Georgy Zhukov was sent to lead the army against the Germans to retake Stalingard instead. He died at the second battle of Stalingard.
Yes, with more competent leadership Germans would have avoid the meat grinder of Stalingard and Leningrad. Even more so when the enemy’s leadership is more incompetent than in the OTL. He has just not prevented encirclement, he caught the enemy in the middle of it and used that opportunity to defeat him. That much is very probable, as Erich knew about the encirclement from soviet collaborators.
Zhukov isn't the only competent general in the entire Soviet Union, believe me if there wasn't Zhukov they would've found someone to replace him, maybe they would lose a few more men in the meantime.
You can't really speed up the Battle for Leningrad other than throwing men and resources (which the Germans don't have) in the vain hope that maybe they manage to pierce trough.
And as I've already said preventing the encirclement doesn't mean that you destroy the enemy army as the best way to prevent it OTL was to retreat from Stalingrad, even if somehow you stop the Soviets they would just take a few thousand casualties and retreat, they wouldn't throw 180k troops at once without thinking and even in the impossible timeline where they do the Soviets have many other armies to throw in the fight, Germans would have to receive a miracle every week to arrive until the Caucasus.