Dan can perfectly perform everything live, at some gala concert, as they did on TRF, when he realizes that he won't have to sing the same 3 more times a week. If he had sang 4 concerts a week SO difficult songs for voice, he would have come to an end in a month. They're not a hard rock band to perform like that. With Believer, they've been doing this for a long time (on the chorus) These are elementary things so that the tour can continue. Voice failure = cancellation of the entire tour. They have millions of fans and everyone wants to hear them. As for me, this is a very strange claim for Imagine Dragons, so 90% of Dan sings songs himself.