And here's the same vocal coach analyzing Jon's Rock in Rio performance
I'll be back later when have time to watch it (this one is longer and my Portuguese is so-so lol)
Edit: This one was harder to understand, the vocal coach was speaking on top of the music at times so apologies if I made lots of mistakes
To sum up:
Jon is singing nasally cuz he doesn't have the power to reach the notes otherwise. He's squeezing the notes to make them sound higher/more powerful, but it sounds too nasal and strained. He doesn't have the power to sustain them too.
I thought he was also praising Jon for singing while playing the guitar (?? why?? I mean he's a pro, he should know how right? maybe I misunderstood, it seemed a strange think to point out). He also noted that Jon was too static at times and praised him when he moved.
The most repeated comment: I've got the impression he's at his vocal limit all the time.
I had a good laugh though, he was poking fun at his nasal voice, and his faces during the butchering of the BWC verses (at the 7min55 mark) were priceless