Not that Guage steel and not in the time it took before the towers fell. Yes the jet fuel can "weaken" steel in a sustained fire that is being fed jet fuel continuously to the point of heating the steel all the way through , no it can't weaken every beam to skip the stage of sagging metal, to just straight up catastrophic failure. It also can't cause molten metal streams to be found MONTHS after the towers fell, the planes, or the fuel is not the cause of the buildings failing.