I don't think we can begin to understand the Lahaina fire, without taking a few things into consideration:
1) Various monied sources have been trying to get at this land for a long time.
2) The governor signed a bill, (only months before), that if there is some type of major emergency, that they can take over the land and build a "smart city" there.
3) Multiple witnesses are saying the fire seemed to be completely under control, up until the point that they turned off the water.
4) They didn't use any emergency warning sirens or public broadcast to advise citizens what to do for safety. (even though that is exactly what they are for and are publicly paid for, only governmentally managed!!!)
5) Instead, those smart enough to realize humans and fire are incompatible in the same space, were directed BACK to their homes (and in some cases, their deaths!) by law enforcement.
6) Multiple military bases, and with fire emergency equipment!!!, are all around the area; yet unlike another famous recent fire, NONE of the resources were called upon.
7) Study the burn pattern.
I believe if we have the complete Truth about it, it won't be nearly as important to see HOW it started as to see WHY the whole circumstance was controlled exactly in the way that would lead to the maximization of damage.