Even if you accept that the feeble little blips in femr2's graphs are some sort of miniscule deceleration they are nowhere near enough to cause building collapse.
It's this kind of thing that results in me responding to you Tony.
What ?
Cause building collapse ? That's what I was trying to get you to see by saying *wrong end of the chain*.
The low magnitude points of deceleration (which are definitely there) don't cause anything at all. They are the result of some collision events which produce jolts at the NW corner.
Now then...
There are NO large magnitude jolts traceable at the NW corner. No-one is arguing that point in the slightest. They are not there.
Everyone OK with that, yes ?
Observation shows that the perimeter sheets do not collide, but overlap as they descend, so no ginourmous jolts are expected from perimeter-perimeter collisions.
That leaves core and OOS regions.
The ROOSD study shows visually confirmable detail which indicates that the internal *debris avalance* consisting essentially of pancaking floors descended far in advance of the trailing level of perimeter destruction, which consisted primarily of *peeling* (caused by the debris funnel descending behind the *crush fronts* pressing outwards upon the perimeter).
As the floor descents preceed the outwardly visible destruction, there's no reason to think there should be any OOS-OOS floor collisions that are traceable at the NW corner.
The core destruction is not well described imo, but it's feasible that the upper 50/60 floors of the core could have been dismembered by the descending debris. CC's are surprisingly skinny up there.
But as I've just described the floors descending first, there's very little connecting the core to the NW corner (hat truss, yeah, but soon as the cap separates, nowt), and again, I wouldn't expect to see huge jolts in that scenario. I know you don't agree.
Elements of initiation, I'm not happy about, but am not going to be jumping up and down making claims without getting my hands very dirty first.
Now, Tony, reading between the lines of what I've just written, I've put on the table... a mechanism which strips the floors from the core and perimeter, and forces the perimeter outwards in peeling motion, leaving only the lower portion of the core standing.
And barring said initiation unhappiness

there's nowt there that intrinsically requires anything except gravity.
I've also described where and why I don't think the observed mechanism of destruction leaves much room for the sort of jolts you're looking for.
I'm also firmly leaving the door open on the initiation side of things.
Stop talking about jolts. It's boring. They are not there.
Apply your time to a detailed description of initiation that supports your position, and absolutely matches observables.