Strzok probably hacked Packers bank and tax records and found something for Mueller to blackmail him with
Mueller isn’t prosecuting Michael Cohen. The office of the U.S. Attorney for the Southern District of New York obtained Cohen’s guilty plea and have granted immunity to David Pecker of the National Enquirer.
The U.S. Attorney, Geoffrey Berman is a Trump appointee but, surprise, surprise, just like his boss Jeff Sessions, Berman has recused himself from the Cohen investigation and his underlings are handling it.