I understood aircraft fire fighting aimed to suppress a fire for long enough to allow an evacuation, not necessarily to put the fire out. And the First responders had three fires to deal with. Not hard to imagine back up could take a while to arrive, or was judged unnecessary, given everything else the Japanese are dealing with at the moment.
Id ignore the 'no evacuation announcement' comment: I've been down the slides for real and in the heat of the moment did not see or hear the cabin crew at the door even though they were praised for their behaviour in the accident report. "I did not hear an evacuation announcement' is not the same as 'there was no evacuation announcement'.
Was leaking fuel ignited by the engine or did the fire spread from the engine?