Okay, I'll bite.
I've argued in a prior thread The Why of WTC 7--Silverstein's Blackmail that it was
unreasonable to expect that debris from the falling towers would have damaged WTC 7, and that since it fell late in the day--and not at the moment of
the collapse of the north tower--that this indicates it was not initially meant to fall at all.
It was done on the fly by the teams that rigged the towers. And yes there is evidence that it could be done so quickly.
Why? Because Silverstein had a fire-damaged building that he'd have to take down anyway--a total loss. Easy, gov't-paid site-clearing and a
guaranteed insurance payout, and tons of pull with the rest of the inside-jobbers, since he was obviously deep inside.
It was a quick and dirty CD, that's why it fell late in the day and everyone knew it was coming down before it did.
Essentially, it was Silverstein pushing his hand, his payback money, a brazen in-your-face show of NYC real estate developer chutzpah.