Just saw this on fb today. Relevant to the recent 'coach conversation'.
Number of head coaches since 2000. A quarter century...
Pretty much sums up my thoughts on coaches. They don't matter much. The players are to blame. Draft/develop better.
The teams with fewer (where most of the SB winners are), happened to have elite franchise QBs. The rest that won had a QB who played at an elite level for that season (Flacco, Foles).