The doctors had a choice, become arguidos for the legal protections it offers (att'ys present, right to refuse to answer, e.g.) and expect headlines that will sully their reputations or keep a low silhouette and try to avoid all publicity. The two who want to offer new testimony may be trying to get the better of that awful choice by cooperating & winning the police over. The two appear to be Tanner & O'Brien and it is no secret the PJ have wondered about them for months. If they really said "We want to be anonymous", that was a false expectation, wasn't it? But I don't believe they ever said or thought that. If so, that hope didn't last 24 hrs.