I'm glad you posted that
For one, I don't think the towers were brought down because of controlled demolition from videos of the towers. The reason I believe controlled demolitions were used was simply to make the clean up easier, I believe thermite was used to bring down the towers. This video did help me for one of my biggest complaints about the whole thing. The video says each floor collapsed onto itself "pulverizing concrete", how does a floor falling ten feet onto another floor turn the floor below it into dust? But the better question is, how does the floor that was turned into dust then pulverize the next floor?
What I'm saying is something I brought up before in this thread, the concrete in both buildings was for the most part completely turned into dust, but with just common sense I think you can easily see why that would be so hard to believe. The floors collapsing as fast as they did also makes this video seem completely wrong, or made by people also using no common sense. If a floor was to fall ten feet, and then put enough force on the floor below it to then push it down into the next floor, etc, with the pancaking described by this video, how did the towers collapse at almost free fall speed? To put this another way, what that insinuates is that the floors took literally no time to be effected by the floors above it's force, because if that were the case, there is no possible way the towers could have came down in the 10.3 or 10.9 seconds they both did.
Finally, if the pancaking theory were to be true, which would then negate the explosives, but still goes against science with how fast they fell, if they did really pancake, then the internal structure of the elevators would have remained standing. Obviously not 70 stories high, but not completely collapsed like they did. The reason being, the elevators and the steel structure was seperate from the floors, it was basically a structure with a building around it, so if the floors did pancake that structure would remain, since the floors would have no bearing on that structure.