Very much hits it on the head. It's not even about position really. You could see both forwards drift out wide on both sides and they're generally comfortable out there as long as they end up getting into scoring positions. Klopp and Tuchel both used Auba on the wing - not as a midfielder but as a second striker running into space and drifting in from the wings, kind of like Muller during his best days. As long as he's more in a midfield role out wide it's going to be hard for him. Auba has to play as a striker released into space, no matter if he goes through the centre or comes in from the wings.