Yes, but you using western ideas on how equipment is replaced with the military in which they rebuild an unit by one of two ways.
1. Units and Equipment are replaced by taking the remains of two or more units and combining units as needed based within Army and Front needs. Which means a tank regiment in this fashion may have one Battalion equipped with one type of tanks and another different type of tanks depending what could be salvage and repaired and what was brought up from the rear areas, including equipment that had previous broken down and left behind by other commands that has been collected and consolidated into new form units...
2. When units are consolidated, the flags of units that have been absorbed could be taken to training area and new units raised.
Both of these methods have been used in the past by the Soviet Army. So it not to far fetch that they would use them again.
With the rapid movement of the 4th GTA, the T-80s in question could of been left behind by some other units of the 4th GTA that may have them and once the maintenance personnel had got the tanks running they were just attached to the unit passing through since the Army would really want to keep things moving and not wait until they had a company or battalions of T80s ready to attach to the nearest Tank Regiment or Motorized Rifle Regiment.
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