I don't think it's for nothing that Kagawa gave a long-form interview to the Japanese media enumerating the various reasons he has had his heart set on Spain for several years. The whole situation under Favre is probably just the final straw, and in previous years you could have easily seen him getting back into the BVB squad with Reus inevitably picking up a knock and Götze not exactly lighting the Westfalenstadion on fire. He sounds like he's done with German football at any rate, and it's very difficult to imagine him going to a Stuttgart or Besiktas. He won't command a huge transfer fee and has plenty of potential income streams, so why not a top-half La Liga team? Perhaps in his mind he feels like he should have taken up Mourinho's overtures to serve as Özil's deputy at RM back in the day.