Of course, as we learned in an exchange a few weeks ago, there really aren't any scenarios where the Germans and Russians would never have fought during the war.
Not only are there not many scenarios where the Germans don’t fight the Soviets, I don’t know if there are that many scenarios where the Germans beat the Soviets. The only one I can think of is that the Germans go into the campaign with the idea of fighting a two-year campaign instead of six months, do a better job of organizing Western Europe’s resources and industry to support the campaign, and somehow manage to up-gun their panzers very quickly in response to the T-34.
But in a few months from now, after the Soviets crack the German line on the Dnepr River, Stalin will tell his generals he doesn’t need a second front to beat the Germans; he can do it alone. By then, he was probably right.