Why could not a hot chunk o'anything make it to WTC 7? We know quite definitively that debris from WTC 2, further away, managed to make it that far and break windows. You are supposing , with nothing other than your own personal incredulity, that nothing hot enough to ignite even paper, and there's a lot of paper still in offices, could reach WTC 7.
Extinguishing the flaming material in the north towers would not cool all that material to below ignition temp of many materials. Dust would cut off oxygen, dust clears and that material will reignite again if it does not cool below ignition temp.
Very odd argument anyway. Yes, the fires over several floors in WTC 1 would be 'out' even in the manner that those 'floors' did not exist anymore.
However, it wasn't me that said that it was likely arsonists that lit the fires in WTC 7. That was you, correction, that was your fevered imagination.
So the dust in WTC 7 would not put fires out and WTC 5 which was not a lot closer, and not in line with a face of the north tower can catch fire and you are okie dokie with that but ,,,, oh noooo, WTC 7 cannot have caught fire from the effects of WTC 1 collapse.