I looked at the pictures of the pile.
Yes, it would have remained rigid, the twisting of the building was the result of simultaneous cutting of the joints. Buildings are made to stay erect, they don't just fall to pieces because of a few column failures.
Just go look on youtube of some demolition failures where they knock-out the base of the building hoping to topple it over but they just end up dropping 30 feet but still standing. Or watch how when they do topple and they are still in one piece.
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