Those cutups are great examples of why I'm so excited for this defense.
First example, Cover 1 Blitz. Looks like you send 6, but a defensive lineman drops out. Back stays in and does a good job because otherwise it's 5 on 4 due to the unbalanced blitz. As is, nowhere to throw.
Second clip looks very similar presnap to the first. Appears to be Cover 1, everyone manned up on the outside. Big bubble signals blitz and the offensive line sets up that way. Instead they drop 8 and are able to get home with only 3. Watch though, the areas of the field that are baits if you did think this was a Cover 1 blitz, like it was in the example above. It appears it's single high shaded to the top side. It appears towards the bottom that you can hit a big play with a Corner, Post, maybe a Deep Dig (which the number 3 receiver on the top side actually runs and gets bracketed). The offense doesn't like it, but on this play a sack isn't that bad of a result.
The third clip is a really good example of how they protect the Rover in coverage. One way to attack Cover 1 is to send one or more alerts down the field, forcing him deep and then attack the middle of the field underneath him. But as we've seen above, they can bring/drop any of those 6 box defenders at any time. On the top inside receiver they have a LB and S bracketing and another LB drops to that hole in the middle.
Pay special attention to the bottom Safety. White uses a lot of off man coverage, and this is a great example of this. Pause the video a few seconds in and see his position. If they throw underneath, that pass is jumped all day. He's still able to drift back and bracket the outside receiver.
Look at how much help that Rover ends up having. Bracket to the top, deep hole defender in the middle, and essentially bracket on the bottom. Despite having all of that help, It still results in a sack despite only rushing 4 defenders vs 6 blockers.