Pro sports teams where the coaching staffs had a split locus of control (e.g. mid-1980s Chicago Bears)

I don't know much about the 1954-1960 NY Giants, but if you have to go back 65 years then it's really not a thing that happens. More of an anomaly from the past.
While true ... if the Saints are insistent on sticking with Dennis Allen, they might have to dust off some old ideas about team management to make the team successful on the field. Might not need a full-fledged Buddy Ryan type to run roughshod ... but maybe one (or both) coordinator(s) that have better people skills and can insulate the players from Allen's worst deficiencies? Just kind of spitballing here ... trying to figure out how to creatively make a gourmet meal out of random sub-optimal ingredients.