“I don't know if somebody "around here" knows something they aren't saying “
I could not possibly say...
The aircraft type concerned does not normally have a “DV” panel, but it does have ventilation via ducts down the side of the fuz. It is possible to shut them off.
I do not think we know what order the key events happened in so what caused the smoke in the cockpit is impossible to know for now. (ie which side of the f/w it all started). The firewall in this case was carbon with metal bonded to it on the engine side.
Rod1