Concrete breaks, rebar bends. A collapsing floor can be in one piece (attached by the rebar) without falling straight and level. Or it could break into pieces if the rebar breaks, or if the floors were built in sections.
We don't know how the floors were falling, but we can see that it wasn't a symmetrical and controlled process, because the centre of the roof caved in, the walls fell at different speeds on different sides of the building, and the structure toppled over.
All of which suggests it was a chaotic collapse, which ties in with the observed behaviour of the escaping air. What it doesn't agree with is a co-ordinated controlled demolition.
Literally the only reason to think that it does would be if an idea you had invested your life in for the past 16 years depended on believing that it was a controlled demolition.