Yes, but objects also follow the path of least resistance; my understanding of this is that when one of the floors collapsed, it would have been easier the debris to have fallen off the side of the building into the air, instead of breaking the floors below it. I remember seeing a buliding collapsing on its own (poor construction I imagine, not a problem that the WTC towers had) and it definitely collapsed in a certain direction and it wasn't a complete collapse either.
And yes, the tower leaned a bit before it was pulverized in mid air. Did gravity do that too?
Kevin Ryan, who has fired from his job for disagreeing with the official story, had this to say:
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Kevin Ryan, the whistleblower from Underwriters Laboratories, did his own brief statistical analysis in a recent letter regarding the NIST report, arguing that probabilities of collapse-initiation needed to be calculated (Ryan, 2005). NIST nowhere provides such a likelihood analysis for their non-explosive collapse model. Ryan’s estimate is that the probability that fires and damage (the “official theory”) could cause the Towers complete collapse is less than one in a trillion, and the probability is much less still when the complete collapse of WTC7 is included:
To follow the latest "leading hypothesis" [of NIST], what are the odds that all the fireproofing fell off in just the right places, even far from the point of impact? Without much test data, let's say it's one in a thousand. And what are the odds that the office furnishings converged to supply highly directed and (somehow) forced-oxygen fires at very precise points on the remaining columns? Is it another one in a thousand? What is the chance that those points would then all soften in unison, and give way perfectly, so that the highly dubious "progressive global collapse" theory could be born? I wouldn't even care to guess. But finally, with well over a hundred fires in tall buildings through history, what are the chances that the first, second and third incidents of fire-induced collapse would all occur on the same day? Let's say it's one in a million. Considering just these few points we're looking at a one in a trillion chance, using generous estimates and not really considering the third building (no plane, no jet fuel, different construction [for WTC 7]).
How convenient that our miraculous result, combined with several other trains of similarly unlikely events [no interception of hijacked planes by the military on 9/11, etc.], gives us reason to invade the few most strategically important lands for the production of oil and natural gas...” (Ryan, 2005).
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http://www.journalof911studies.com/...ollapse_Jones_Thermite_World_Trade_Center.pdf , page 40
But perhaps you'd like a second opinion, from a site of architects and engineers, perhaps? From Architects and Engineers for 9/11 Truth web site (complete with some very educational pictures):
http://www.ae911truth.org/twintowers.php