I also noticed the last few days that the Southern Ukraine situation is deteriorating fast on the Germans.
The German 9th Army was mauled in the Orel salient but Model withdrew it intact and right now the Soviets are leaving it alone. Second Army, always a weak formation, did not take part in Citadelle but now Cherniakovksy’s 60th Army is cutting through it and driving on Kiev. 4th Panzer Army, exhausted in the July/August fighting, has been chopped into 3 pieces and is being driven to the west. 8th Army, f/k/a Det. Kempf, along with 1st Panzer Army, are not being pressed hard. Tolbukhin’s diversionary attack along the Mius River in late July badly weakened an already thin 6th Army. Now he is attacking for real and 6th Army is on the ropes. Some of it’s units are fighting out of encirclemnt along the sea of Azov. Most of the German troops will get back to the next defensive line, but there are too few of them and no haevy weapons to hold any line.
In short, the Soviets have inflicted losses on the Germans that they cannot replace. And now the Germans are past the tipping point where they can no longer effectively defend themselves.