A note about concrete construction. You can pour a concrete form really, really quickly. If a concrete core structure was even remotely capable of standing unsupported, then civil engineers would pour the full 400 or more metres of concrete in one fell swoop, clear the concrete plant and contractors off site for a fraction of the cost and then let the steelworkers catch up at leisure.

But it doesn't work that way. The core can't stand without the outer structure and the outer structure can't stand without the core. In super-tall buildings, the outer structure is the principal load bearing element.

Royston, the core structure was not concrete construction. This is a fiction and a fantasy that you appear to need to cling to because you can't face the reality of the situation. I have already provide proof that the core was not concrete construction (which I have already invited you to examine) and I just now posted some more. If you continue to choose to cling to the fantasy that it was a concrete construction, you make yourself look far more stupid than the people you are accusing of looking stupid.