The demolition expert in this video, Danny Jowenko, does not think the Twin Towers were brought down by controlled demolition due to their unconventional nature, but as the website 911review.com has pointed out:
A demolition that is planned as part of a covert operation to fit a narrative of events that attributes the total destruction of the building to a different cause (such as a jetliner crash and consequent fires) has a very different set of requirements than a demolition that is planned to legally remove a building in an urban setting.And as 911blogger.com user "stallion4" has noted:
The towers weren't conventional demolitions. They were "top down" demolitions, which are rare in the professional demolition industry...Despite claims to the contrary, Jowenko has remained quite sure WTC 7 was a demolition. Perhaps the more conventional nature of WTC 7's demolition can be explained by evidence that indicates 10:45 a.m. was the originally planned demolition time.
Building 7 was a classic demolition job -- bottom up -- the type of demolition that Danny Jowenko is qualified to give his professional opinion on.