I think Jared Kushner is "Anonymous" who wrote the Warning book and the NYT op-Ed.
Trump was so cagey about Anonymous, basically "I know who it is but don't ask me any more about it." I get the impression Anonymous is still there, and is someone he CAN'T throw out, at least not right now. I'm waiting to see if after Trump is re-elected, Jared and Ivanka announce they will be leaving the WH for whatever personal reasons. I think it will in fact be that they were asked to leave.