I don't think there is an alternative to KDB, just like there wasn't to Pogba. We're trying for very high level players now and they're not plentiful. People mention Isco, etc., but how do you get a player from Real Madrid who neither wants to leave and the club does not want to sell?
BTW in all this furor, the print version of Sky's KDB stories still says we're favourites. Bayern obviously counted on getting him next summer and don't have the means to match our offer right now. If they did convince Wolfsburg to do this though, it would present the Bundesliga as one of the biggest joke leagues in the world for competition when the (current) #2 team bows to the #1 team instead of selling the player to a club far away.
I still think he'll be ours because he's happy to join us and our offer is still the best. But we'll see...