I think anyone signing Auba for big money is taking a huge gamble. He's always struck me as a system player, he is perfect for the way BVB play, but take a look at his goal compilations. He scores a lot of similar goals from similar positions and if you can't get him set in that poacher role then he'd struggle. Also given his age offering him a big money contract is going to see whoever paying him lots of cash as he starts to diminish as a player.