WTC7 collapsed several hours after the other. If it was a controlled demolition, why wouldn't they bring it down at the same time as one of the other towers fe

WTC7 collapsed several hours after the other. If it was a controlled demolition, why wouldn't they bring it down at the same time as one of the other towers fell? The debris cloud from the larger towers would have covered their crime, and I don't think anybody would really find it very suspicious that one building was evidently crushed at the moment another was falling next to it. Therefore it makes more sense to me that WTC7 fell exactly as the official story describes. It was damaged and burned for hours, then the penthouse fell through knocking out much of the interior and the facade came down moments later.