Not exactly sure what you're driving at in post above, but a sudden, downward movement of even a couple of feet could have led to a complete shearing off of multiple beams along multiple lines at once, and caused a regional collapse that progressed rapidly to other surrounding areas. What we see in the video is that the lower portion of the building starts to move simultaneously with the upper part of the building, indicating that the failure took place at the lower levels, then the rest came with it. It didn't appear to be a progressive failure starting from the top. But that's based on one grainy video where you can't see the precise beginning of the collapse.
The regional nature of the collapse points to a larger-scale failure, consistent with a "sink hole" or some other geological formation failure below the surface. Either that, or there was some kind of massive failure of a single element, which doesn't seem likely on a building that was designed in a relatively modern era of a major city.
Roughly speaking, each column (and pier foundation element) could have somewhere in the neighborhood of 3,000,000 lbs or more, so the scale of the loads on the rock below is hard to comprehend.
Someone also shared an article claiming that settlement up to 1 inch had been detected in the building within the last year, which would be a massive amount movement for a building of this size (presumably) founded directly in rock. Any building designed with piers into rock, the assumption is that settlement will equal zero at the foundation level. So you're talking rock formation collapse or seismic event. Florida Building Code doesn't even have seismic design in it. The assumption is that seismic events don't happen in Florida, so a seismic movement event seems really unlikely and/or would make them re-write the codes for this event.
But also... I'm not an expert in high-rise construction, so my insight is pretty limited.