I've been wondering how fire manages to damage a stucco/stone house in the first place, especially in some of the cases where there wasn't much vegetation around. The scale of the fire must be quite immense and counterintuitive to get the outcome seen on news photos/footage.
I'm speculating, but it could be the wooden eves, window frames, and wooden doors that allow the fire to get a foothold. If the roof is vented, it may suck in burning embers.