Never left. Having said that, the characterization of Thor is cringe-worthy. I don't mind the occasional replacement character like Jane as I didn't mind Masterson, they're just temporaries who eventually go away after their stories have been told. What I don't like though it how Thor's and Odin's characters have been twisted. I understand development must happen, but that was just bad. And it's not Aaron's fault either, this started right after JMS left the book.