I think that a big part of it was that the vocals were so muted, you could barely hear her at times during the TV recording. Sometimes you would hear PECO over Ayu in chorus segments where there is supposed to be harmony... and you wonder where Ayu's voice went.
It has been said before here that perhaps just being there at the concert makes things sound way better than they do. I recall SunshineSlayer mentioning that she saw a CDL live and thought it was fine, and then she watched the TV version and was like: "Wait, why does her voice sound so weird? I WAS THERE IT SOUNDED FINE." so... hm.
Maybe you could watch this Sunrise live and see if it sounds a bit different to you?
Note: I LOVE this live arrangement.
On another note: How
ridiculous does Ayu look when she's introducing Yocchan? I feel like this happens every year, hahahaha.