Still back to your earlier post, without the battery connected & no power the wheel should still turn and ride as normal in low gears. As I mentioned if the wheel does not turn then one suspects an electrical phase issue. So try the simple test I mentioned and disconnect the motor cable form the controller box to identify the fault better.
It will be from what I read a faulty controller or hub phase, I suspect a controller fault due to the arcing/melted battery connections and blown mosfets or melted phase wires at the controller end.