Sometimes major fall events happen without any of these factors being present. Erosion from running water and repeated freeze/thaw cycles fractures and weakens rock over long periods of time, setting up conditions for major fall events. You have to eliminate that before you can attribute it exclusively to the concurrent events.
True. The things I listed were just stuff I could think of at the moment. The freeze/thaw thing also plays a role in rock slides in some areas.
Re: freeze/thaw
Water seeps into the cracks and crevices, freezes and expands (like a soda bottle left too long in the freezer), burst, and splits the rock apart. Heating from the sun also expands rock, which then cools and contracts at night. Repeated cycles of this also weakens and breaks down rock.