Explain building 7? OK, I will give it a shot. So, when you know... Like, you have six buildings, and your thinking about building another, you start looking for a way to refer to it - just for convenience sake. People are not always very smart, so just calling it "Yo other building" frustrates bike messengers.
Explain why building 7 went down when it was never hit by a plane, and only suffered minor damage. Even if steel is bent from fire, it doesn't cause it to collapse. That is why they use steel for buildings. As well, if it had collapsed they way we were told, it would have been unbalanced, and fallen off to one side, not completely symmetrical with the completely aligned and intact. Furthermore, the collapse of Building 7 was omitted from the official 9/11 report.
Compartmental fires can reach upwards of 1200C degrees depending on the materials burning inside and the openings. Steel melts at 1370C. Couple the fact that the steel is softened but not quite melted ... But it is heavily loaded upon by concrete/brick etc ... Its pretty conceivable that the steel could fail under those conditions.
As far as aligned and in tact ... It makes sense that the interior steel would fail first versus the more readily cooled frame of the exterior. Of course its going to implode, in a sense, if the interior of the building failed first.