Do you always answer a question with a question? In answer to your question: I've seen interviews with former Federal Prosecutors, etc.. that have said that it's prudent for the investigators to want to gather all the evidence before cutting a deal with Flynn or indicting him. That makes perfect sense to me. Remember that Flynn's investigation is part of a broader investigation so it takes time. The Pentagon's investigation only started a month and a half ago! Again, Flynn took money from foreign governments and made foreign trips without prior permission from the Army and he is being investigated for that by the FBI and the Pentagon's Inspector General, he lied about it to the FBI (among others) and he lied to the FBI (among others) about his meeting with Kislyak. Those things are illegal. You still going to deny that Flynn broke the law?