Reply #303: Just because you can't think of an alternative explanation...

[Make7]

...is no reason to insist that the picture in question shows a "concrete core". That is not proof - it is what you believe based on how you think the building should have fallen.

The fact remains, just from that picture, the construction method of the core cannot be determined. To claim that it actually can be is assuming many other things to be true, which you have not been able to demonstrate.

I haven't even seen you come up with a reasonable explanation for why you conclude that steel core columns, if they existed, should be seen in that picture.

-Make7