Ultimately, healthy organizations need to put their HCs in a position of strength and to succeed.
Linehan had no business being a head coach, in the draft room or making any football related decisions, yet somehow he blew away the Rams front office during his coaching interview. The Rams were one of the most dysfunctional organizations in sports, didn't have a real GM or even a real scouting department. One of the oldest, most decrepit rosters in the league that was losing what little talent it had every year and no reinforcements were coming via FA or the draft. Probably the worst offensive line in the league and veteran players quitting during games. Anthony Hargrove disappearing during the season so he could go on a cocaine binge in his basement and Richie Incognito faking a stomach ache so he could get out of playing. No leadership at all, from ownership on down.
Spagnuolo took over when the Rams had the most instability at ownership, Chip and Lucia wanting to get rid of the team as soon as they inherited it. And after completely bottoming out, burning out what was left of the Linehan wreckage, they had less talent than any other team. Devaney shouldn't have been a GM, but neither him or Spagnuolo had any shot of being successful.
Fisher and Snead got the Rams drafts back on track, Day 3 picks and UDFAs improving almost immediately, and they started hitting on their first rounders, too, all of which paved the way for the Rams to finally break through. Fisher took over "need city" and made it semi-respectable. His last year with the Rams, though, was as hard to take as any of the Linehan/Spagnuolo years. It only took their first game in LA, a 28-0 shellacking, the Case Keenum "ghosts" game, for the Rams to be pummelled in the headlines and ridiculed nationwide for that effort. It did not get any better, and it was one PR humiliation after another, until the point Demoff wouldn't confirm that they had extended Fisher, because they didn't want anyone to know.
From the Rams waning days of the GSOT to the end of Fisher regime, the Rams failures had many fathers. As an organization, they needed to remake everything about them, which is one of the reasons why it took so long to finally build a playoff contender.