What does the existence of molten steel prove?
That more than jet fuel was involved in heating the site.
Jet fuel burning at maximum efficiency doesn't get hot enough to melt steel. I don't know of anything else that would have been in the towers that could have just happen to have provided sufficient fuel to melt steel either.
Take the Madrid fire. Did you happen to see that building burned to it's shell? Yet the steel didn't melt.
Did the WTC look anything like the madrid fire before it was demoli--- i mean, before it catastrophically collapsed (lol)?