I've seen TBS live 3 times unintentionally. At each performance, Adam was very pitchy and made the crowd sing all the parts he couldn't. I think major fans are fooled by the collective spirit of the concert and because so many people are singing the words.
anybody who's been a taking back sunday fan since the beginning knows this and frankly doesn't care. it's more about the spirit of the crowd, the energy, a little nostalgia, and less about the voice.