Ok, maybe I am not clear, there could be an initial wedging effect.
This is always the picture that I have in mind when thinkg about the WTC cores. Inner and outer cores with their own resp. purposes.
First of all the initiation problem is a different thing but assume it happens locally due to a local defect we are still having
an intact building outside of that impact area. A failure will lead to a new stable situation but one assumes a tresshold to overcome
which leads to 'the towers are doomed after that'
Now look at this, what is going to wedge? Funneling is possible when a structure that stays intact is able to fall into an open tube structure.
We believe that both sections don't stay intact (even the Bazant model assumes that and it must assume that because otherwise buildings don't fall...)
and that implies there is no wedging effect. It debunks the whole idea of complete funneling.
Only rubbish will fall on an intact building. One of the leading models (Dr.G where are you...) is that we have a top
section that will collect floors on its way down to the bottom and will together with a compacted layer of floors unrip the next floor and so on.
This is in fact the discrete Bazant model, but this is not funneling.
An intact top section is IMHO only able to funnel through a building if the inner cores are removed. It looks indeed that is the
case in your picture which means the Bazant model couldn't hold. Or is there an other explanation using the above picture ?