If this were true, then the building would have weakened at the bottom, first.
As we can see from the following video- NOTHING ABOUT YOUR STATEMENT IS TRUE:
The collapse was not "almost free-fall", it did not weaken at the bottom, and it makes no sense at all to have bombs in the basement an hour before the horrible event shown here.
You are making a claim that cannot be proved to be fact. You are wrong to make it, and you are not getting let off the hook. In your video we are looking at the exterior of the building, not the interior core. The two parts of the WTC buildings are distinct and could be affected separately. A perfect example of this is WTC7, where the penthouse dropped first. What this shows is that the interior sections of the building were taken out first before the exterior. Had there been no penthouse, we would never have known from looking at the outside that the center sections were collapsing.
There is once again, NOTHING in your video that tells us anything about the strength and positioning of the interior load-bearing components (namely the core), and you have no credentials, expertise or other evidence of your own to back up your absurd statement.
The buildings were constructed as "tubes" fitted around a 47 column core. The is no reason why we would know what was going on inside those tubes from watching one youtube video of the exterior of the building.
You have nothing and you're going to have to do a lot better than you are to convince me, or anyone.