As far as changing the ‘culture’ of the team... I still give credit to Fisher for being a bridge between the days of hopelessness (Spags/Linehan) and the days of glory (McVay).
Say what you will about Fisher, but... his players tried their guts out for him, and he helped make the Rams respectable again. Also...notably... I don’t think I’ve ever heard a former player EVER say a negative thing about him or throw him under the bus. Fisher definitely had a huge overall positive impact on the ‘culture’ of the Rams.
BTW, he had a weakness for picking stupid players, his teams were undisciplined, and he couldn’t field a competent offense to save his life, yadda yadda yadda. OTOH, his defenses were always solid, and I think most of his players admired him and played hard for him.
Anyway... I’m not taking anything away from McVay, who I think is the best thing to happen to the Rams since, uh, the dawn of time. Just noting that McVay took over a decent team that had some tools to work with... and *some* of the credit should be given to Fisher.