Edward O' Callahagan was a senior Justice Department official, but he was political appointee, not career, and from what I remember closer to the zealot level of Trump supporters. He co wrote the memo.
All admins struggle with this but this clear example of why you don't want political appointees in senior level positions. Regardless of the complex legality of the Mueller report, the investigations, the special counsel, you don't want senior level officials calling the play for OVERLY political loyalty.