I see you are taking Tony's statements with blind faith here. What assumptions is Tony making in order to make his statements, and has he validated those assumptions?
Three threads, a couple of thousand posts, and the original context (assumptions AND ignoring a lot of factors

) are still in place just as
Tony took the lead over from C7.
Nobody seems to have noticed that Tony has actually conceded a couple of the key points you and I made way back at the beginning. Remember the columns which could not have moved?
You seem to be confused about what constitutes answering a question. I didn't ask you about NIST and physical evidence, I asked you about Tony's assumptions....
...yes.... but... it doesn't fit Red's SOP to respond. He looks for the little bits of loose logic debunkers often leave him THEN attacks there with his stock in trade of ambiguous definitions of words playing the 'tight' definition off by use of innuendo against the 'loose' one.
Specific example of that ploy as you identify it:
Nice dodge, going back to your old Physical Evidence chestnut. I'm sure it will generate plenty of endless debate distraction for you, as it has so far. Ahhh, the old standbys, eh?
It works for Red's standard mode of trolling so why should he change?
Not actually true. It's obvious the girder was displaced because we observed the building fall down. If it was the initiating event is debatable....
Mmmm....
...Is there any reason to consider anything other than fire? I can't think of any (nor has anyone come up with a plausible one).
That remains the overriding question. Nobody in trutherdom has ever made a coherent claim to prima facie level for CD in the WTC collapses. All this 'NIST wuz wrong' derail is still irrelevant - except for those having fun proving Tony wrong of his false claims.
Tony has even failed in his tactical ploy tried to pretend that CD was not under discussion and limit discussion to the claim that 'NIST was wrong'. Sadly he has lacked the discipline to stay with his own plan and has revealed his CD claim - from memory at least four times but I cannot be bothered counting. Someone else can check but he has made the tactical mistake, multiple times, and the exact number matters not.
Which is sad for Red's bit of 'fine logic' trying to hold to the line that CD is not on the table. Tony has put CD in the debate despite his own attempt to avoid it.