Per 5.3, "That is, friendly units negate Enemy Zones of Control for the purposes of tracing a Supply Path."
Does this remain true if the friendly unit itself is OOS?
I am loooking specifically at a situation where two German armies are boxed in by Soviet units west of Voronezh. There is no question that they will become OOS on the first supply check phase. The question comes wherein a German unit from Kharkov will move adjacent to the German encircled units, thereby "opening" up the supply line trace,
BUT WAIT, if the Soviet had placed the "Cavalry Raid: Play at the Start of the German Organization Phase to put an 'Out Of Supply' marker on any one enemy unit." (i.e., the one beginning in Kharkov), does this then negate the supply trace, thereby forcing a surrender of the encircled units at the removal phase?