If Marotta and DN have no intention of selling Diego, but think they can use the player as bait for Dzeko, meaning they all-of-a-sudden remove Diego from any sort of transfer Wolfsburg had in mind, then they should be fired immediately. There is no better way to piss off a club than to lie about using one of your own players in exchange FOR a player you are approaching to buy.
It's ridiculous, and clearly not logical. I have no idea why some think this is a possible explanation for all of this.