1. Normally steel structures do not collapse due to heat. Everything else burns leaving a steel skeleton!
I see. In that case I look forward to a detailed rebuttal of the various points put to you in my post regarding fire testing of steel and building regulations. Because if you cannot do that, then a major part of your argument fails
2. Local collapse of any steel part of WTC1 is not expected in WTC1 given the circumstances. If for any reason, e.g. bad steel/workmanship/quality, a single part (a column?) would locally collapse releasing energy, the redundancy ensures that no progressive collapse would occur, i.e. the energy released is absorbed by the intact adjacent structure. The local collapse is then arrested.
You've not responded to my point regarding the capacity of the structure to transmit such loads, pending which you are indulging in nothing more than unsubstantiated speculation.