This is honestly such a spectacular shitshow. While simultaneously being an incredible work of financial engineering to manufacture these levers and injections of cash. Likely we will see courts involved, and it would be interesting if the nonpayment results in barca retaking ownership of assets that were "sold" last summer. Effectively renewing a "lever" for them.
With the new FFP rules, there are going to be more stories like these. As Barca fan not really worried, since as you mentioned, if we don't get paid we get to keep the original 20 million and get back ownership
I read somewhere he has a special release clause in his contract if he isn't registered by a certain date, so he would probably end up back at Man City (or if someone else wants to snatch him in a free)