If there was molten steel, I don't know what melted it, or what kept it molten for five months. However, if there was molten steel five months later, something must have kept it molten, and that something wasn't thermite. Therefore, if there was molten steel something was going on in the rubble pile that could have melted the steel. The fact that we don't know what it was, doesn't mean it doesn't exist.
The irony in the fact that you're displaying the exact behaviour here that you pretended to see and satirise in your opponents recently is not lost on me. You can't figure out what it was, so it doesn't exist. Except that it has to exist, so it does exist. Your whole argument is based on claiming that a heat source capable of maintaining steel above its melting point, and hence quite possibly of melting it, both existed and didn't exist at the same time and place.
Dave