We don't need to bring back anyone. We need to look forward and get rid of the seniors.
No Xavi. We need a Bielsa, Klopp or Nuno.
We need a manager who is empowered to bring about the necessary changes required without pandering to the needs of some entitled dicks.
Xavi would have a lot more backing of the board than any of the guys you listed. And we, quite frankly, dont know how cynical he would be. Why assume that he would be soft?