Here is the picture, basically at the start of Turn 3 (I did one attack somewhere where my infantry line is). I’m playing the Axis.

Background to this picture:
Turn 1, only one panzer group can move (down south) so I moved them. Turn 2, everything can moved, and so I pierced the soviet line in the north and in the center, and exploited every armored unit I could through the gaps. By the end of that move, I had cut off ALL of the Soviet units west of my units. You can sort of see how it looked in this picture. I knew there were places where the Soviet could plug the distance between the encircled units and free units near Moscow. However, I thought the encircled units would have a MUCH harder time moving eastward since they were out of supply.
Well, in talking to the Soviet player (who has been very amenable to discussion; we’re both learning), he said his isolated units (at start of T2) had pretty full movements because they didn’t move in T1 (since they are basically inactive T1). I was VERY surprised to see how far east they could go. The Soviet player saw exactly where he had to plug the line to escape isolation, and as of the start of MY turn 3, NONE of his units are isolated, well a bunch of mine panzers are.
Fine, I expected some isolation of my units. What I didn’t expect was the way he managed to pull so much of his isolated units back. I don’t think I did a poor job, per se: I only had so many units and so much movement. It took me hours and hours just to figure out how to create that line that cut him off from north to south (and I’m pretty proud of it, though maybe I won’t be in a couple turns).
I have several requests for help here:
1) What can I expect in terms of combat power of the Soviet units who WERE isolated at the start of the Soviet T2? Both those that moved and those that did not move?
2) What can I expect from my isolated German armor units in terms of combat performance if they are NOT relieved from isolation status? Will their morale/TOE help them hold out, or if they get attacked, are they doomed?
3) What SHOULD I do in terms of executing the scenario victory objectives? Kill units, consolidate my own supply situation (T4 starts mud) or try to keep out-maneuvering Soviet units trying to re-connect to their supply network?
Any other advice on moving FORWARD (not things I should have done differently before this developed) are much appreciated.