BB uses a systematic approach to coaching. Coaches are not just "granted" titles and positions unless they have filled that specific role for him previously.
Patricia has never filled the offensive coordinator role for Belichick previously.
Coaches are moved to new titles year to year. They grow in the system and are elevated based on performance and experience. None of this year, or its approach regarding coaching system is "new".
Belichick has never made a previous defensive coordinator, his offensive coordinator. That has never happened.