Perhaps, but also that the Red Army had more modern tanks in the southern army group sector.

Also I have seen being discussed that Rundstedt was receiving troops from the Balkans´ offensive last so he was already underpowered when starting the Barbarossa on 22nd June.

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Yeah, the south had more Red Army troops, because it was obvious (to Stalin...) that the south was the most strategically valuable part of the country. Grain, food, industry, raw materials, etc.

Additionally, the Soviet commander in the south (Kirponos) used something of an in-depth defence rather than placing his troops up front to be encircled and chopped up.

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"Nervous wait for the whistle to blow
Rush of blood and over we go..."
- Iron Maiden, "Paschendale"