They need to stick to their original plan. "When We Were Young" has bags of potential with the promotion, video and Spotify release yet to happen. "All I Ask" can get its own separate single treatment further down the line if they want to.
Its propelling success is very promising though.
They might not have a choice. The UK made SLY a huge hit way before Adele and co wanted it to and they might just do the same with AIA.
