On landing, there was no fire chief available to assess the situation. So the decision to sit tight cannot be attributed to a fire chief, he was not there.
That is where we beg to differ. From the time the aircraft came to a standstill until the time the fire chief arrived would have been the time the flight deck crew were fully occupied assimilating their unexpected situation, (no fire warnings prior to landing), and completing the emergency check lists.
Myself included I believe we are all guilty of reckless speculation without having access to any of the facts.