Jowenko is a curious case because he did not think the towers were demolished using explosives, but he did think 7 was.  The trouble with the interview is that he did not realize upon watching 7 collapse that it collapsed on 9/11 and that it had been hit by debris and was on fire.  What substantiates the case of 7 for me is the FDNY knowing that 7 was doomed before it collapsed.