Though i have moved on in the lesson, I made a separate version so I could play with it. I wanted to find a way to highlight the offending bezels but just running out of gas tonight. https://drive.google.com/file/d/11utvYtuitga72YcY07C__NawQPkQ5fYB/view?usp=sharing
so the group on the bottom is applied bezel. I think from top view you can really see how the corner edges are not 45 degrees on the bottom left 2 group.
The one on the right is the winner (on the console too) at 45. the one in the middle is like in the video, and the one on the left is the M shaped one. i dont think any of them have a chance to have a double vertice because I was just selecting 2 edges and pressing f on the left and middle ones. Like I said, I have moved on but am interested on the method of connection and best practices when it comes to this.