On the video being of the same one for both side boosters, the best confirmation I can give is if you watch the landing burn again, you can just see for a brief moment the side booster that landed first from the side booster that landed second's camera. I slowed down the video to make sure I was really seeing the other booster in both screens. It looked to me like they might have realized the issue and tried to fix it the first time the video dropped out long before they separated from the core. I hope they got their TM data from both side boosters and that they got a reasonable amount of data from the core booster- ( I presume it was lost on landing since they've not said anything yet)
I can't imagine getting all the TM bandwidth they needed to get this data- That in itself was an amazing feat. They have the video streams, but they also have pure data that we don't get to see-
I'd still say this was about the coolest thing I've ever witnessed. It's right up there with Saturn V and Space Shuttle launches in my book.