In just under a year’s time, Sum 41 will be no more. But before the Canadian pop-punk legends call it a day, they’ve got a huge tour, not to mention this month’s outstanding final album. For one last time as Kerrang! cover stars, Deryck Whibley and Jason ‘Cone’ McCaslin reflect on their decision, what they’ll do next, and how right now the band are “the best we’ve ever been”…