I expect Taliban would start to get heavy resistances in :
1. Balkh. Dostum (Junbish) that were fought against Taliban for decades.
2. Massoud's son and its Panjshiri fighters in North of Kabul.
3. Afghan Govt in Kabul.
4. KPF around Camp Chapman. But if they are heavily overrun, this one could evacuates to Kabul anytime. If this one retreating, then it's understandable, because they are possibly become an enclave.
CMIIW