^ Trust me, I know when he's honestly good and when he's lip-synching...example of flawless live is "Last Song" during the Sixth Day Seventh Night tour...that's the performance with him playing piano. "Oasis" was also perfect during that tour. Both were live because they sounded way different from the recorded version; I can tell because the vocals sound great but not EXACTLY THE SAME as the track, in which they were with Lu:na. I listened to the live and the track over and over to compare
I love him as much as you do but he just cannot sing Lu:na live it seems. The one time I saw him singing it live it was horribly nasally. I guess he just knows his strengths and weaknesses and is choosing to lip-sync when necessary.