Michael Cohen was a low level lawyer in the Trump Organization; when he was needed, he worked small nuisance suits for Trump—writing letters, negotiating slip and fall settlements, arranging non-disclosure agreements, etc. He was not “Trump’s attorney,†in the sense that CNN liked to portray.
When Trump need high powered representation, he had top law firms and attorneys representing him on big, important legal cases. Cohen knows nothing of Trump’s inner workings.
His book, if there is one, will probably do as well as Comey’s did, which is not well at all.