Ronaldo.
There were rumours last season that he was being offered around, with PSG especially mentioned, for £48m. The story was Real didn't want to pay those mega wages now that he's moved out of his peak and is in decline, that they want to build a team based around Bale instead (lol). There have also been lots of stories since about him agreeing a new contract; "Ronaldo will sign a new contract".... at the end of the season, before the Euros, after the Euros, before the start of the season.... but it still hasn't happened.
I think if there's truth to the whole madness thing then it's this we're trying for. Sure, his wages would be two or three times what Sanchez and Özil earn but when a guy has won three Ballon d'Ors and as many Champions League then he's kinda of earned that right.
He'll no doubt sign a new contract any day because Real would be mad to sell him, the Euros showed what a phenomenal player he still is. I'm sure the stories linking him to other clubs were all part of getting one more mega contract from Madrid, but then stories of him being unwanted at Madrid and shopped around are not something that's gonna come from his camp obviously - so maybe there's something to it?
I reckon the next phase of Ronaldo's career won't be as a flying winger scoring 50 goals a season, it'll be as a Number 9, out and out. I think he has serious potential to make that transition and continue to score as these unbelievable rates - there's a lot said about Ronaldo's intelligence relative to Messi but the guy is simply other worldly in the box, his movement is second to no one - I hope Real don't have the imagination to see that possibility. Wenger's eyes would have no doubt lit up watching him this summer in the role.
Maybe next season if he doesn't sign this new contract, with only a year left....