The imagination is yours, Vince.

To say that the floor was the "Only Concrete" in the place...?
One would have to Imagine that...
There was NO Concrete...
-- In the Central Core.

Which, of course, you have already chosen to do.

As for tenants being moved around the building...?
Again, I would point your attention to the video...
-- From 1:23:30 to 1:23:40.

The Towers were full of vacant offices...
And...
Tenants could be temporarily moved around for upgrades...
-- As Aon Was.

Regarding Aon in particular...

Its New York offices were on the 92nd and 98th-105th floors of the south tower of the World Trade Center at the time of the September 11, 2001 terrorist attack. -- Source

Aon was Still the listed tenant of the 98th floor...
And yet, Scott Forbes says that...
They "Had Been Moved" and some sort of "construction" had been taking place.

Now...
-- Unlike Firemen reporting multiple Explosions...
Noticing that the people in the office on the floor above you...
-- "Had Been Moved"...
Isn't "specialized" information.
It's just a simple observation.
-- They WERE There...
And...
-- NOW... They're not.

They "Had Been Moved"...
And Then...
Some sort of very noisy "construction" work began.

Again...
This is Not "specialized" information...
It is just a simple observation.
And...
For something of this nature...
-- Taking into consideration that...
-- When Mr. Forbes actually went upstairs to sneak a peek...
-- He found Completely Empty Space...
I'm willing to allow that Mr. Forbes...
Is entirely qualified to make such observations about his personal surroundings.

Heck...
I'd almost be willing to assume...
That YOU were "qualified" to make such observations.
-- (Almost).

-PRev1-

President Barrack Hussein Obama

-- Nobel Peace Prize, 2009 --
"War is peace. Freedom is slavery. Ignorance is strength."
-- George Orwell, "1984" --