For the music video they took their long time good friend Ezra and substituted him in replace of Jack for all the shots and Jack is the lead singer- he came on at the end. For the actual vid though, they used multiple of their previous videos and put them all together with Adam, Ezra and Ryan. That's why there were two vids playing side by side at the end and only fans would really understand because most people won't have watched the other videos first. Good reaction :)