Lahaina was built where it is because it's the best harbor in West Maui. That harbor is the landing spot for most of the supplies (food included) needed in West Maui (and serves areas outside of West Maui in terms of supply chain). THere's no way to just airlift building supplies to some other place in Maui. The harbor will have to be rebuilt in order for any other rebuilding to go on, in my opinion. The barges with building materials are more efficient than trying to bring more Big Trucks to Maui.
There's a reason that Lahaina was the main settlement on Maui, even in prehistory.
There is no source of significant lumber in the Hawaiian islands.
Table 5 in that document shows that wood, carpeting, windows and shingles all come from outside the islands, usually via Oahu then by barge to Lahaina's harbor for those building on the West side. Kahului Harbor will have to absorb the extra shipments as rebuilding starts.
When my mom built her house on Big Island, the lumber came from Washington State and landed in Hilo. She and my brother then transported it via pick-up to her building site. She did this twice. She and my brother built both houses with their own hands. My brother took out a loan to buy a Bobcat for the earthwork part of the build, and is still a contractor on Big Island (and will likely be going to Maui to help out once materials can be provided). My mother was one of the few children to survive the tsunami that hit Hilo and her village, Laupahoepahoe (April 1, 1946).
People still own their own lots, if they owned them before this disaster. They will get some federal assistance, if this fire is handled like the California wildfires. The problem of course will be the exceptionally high cost of transporting building materials to Maui. Any attempt to build high rises in historic Lahaina, capitol of the Hawaiian Kingdom, will be met with outrage and stiff opposition, as it does everywhere in Hawaii right now. Downtown Lahaina/Front Street is a federally protected historic site. Attempts to circumvent that protection will land developers in court for years to come.
If things were fair, there would be a federally organized attempt to bring the lumber to West Maui.