Oh boy is David shaky... he was definately not hitting certain notes at first, but all the way through it, it sounded like he still doesn't have it. He's not even trying the primal noises; I can understand being careful, but because he won't even do it, that right there is usually a red flag warning that his voice is still healing. Not a giant red flag, but still a red flag.
In all honesty, I personally think he shouldn't be back on the road. I think he still needs more time. And I'm sure others agree when I express my concern: I am thankful beyond belief that his condition wasn't permanent or life threatening. So, hearing that he sounds like he's still in a recovery mode, I'd rather not see him end up back in the same situation, if not worse. Just because he got the "OK" to go, doesn't mean he's totally and completely out of the hole.
I'm not trying to let that fear manifest, but I am worried. I will, however, just cross my fingers and say "He'll be fine; he'll do great." It's really all that I can do.
Sorry for the long comment and coming off like a nervous ninny, but that's just my opinion on it all after listening to him in that video.
On a side note: Damn that was a badass setup on the stage and in the screen background!!