You're correct about being able to see what happens to the spire in the first vid better. The parts I like about the second vid is that in frames 12-32, you can clearly see (it seems the best one for this) the entire spire including a clear view of what's left of the core at the lower parts of viewable area. The frames starting at 41 and going to 59 give one of the best views of the remains of the core I've seen.
All someone has to do it watch both videos and it should be clear that the spire isn't 'dustified' (dustified, really?) The core obviously collapses near the bottom and when the tallest spire sinks, it leaves a dust cloud that is the shape of the spire but if you pay attention, you can see the steel inside, sinking with the collapsing core.
Finally, there were 'researchers' who believed that the core was reinforced concrete and no amount of data would change their mind. Yet, in the second video, it's obvious that the core is steel. The video of the stairways where the trapped firefighters were shows an obvious feature, you can see the staircase not because the cement broke away, no, because the doubled up gypsum board that had blocked some survivor's way down appears to be blown off. In the still photo I'm talking about, you can easily see I think, five stories worth of emergency staircase, exposed because the gypsum was missing.