I think you’re being wildly optimistic, SJR had 7 managers in 5 years at Nice. He’s had 2 in 12 months so far at United!
Despite taking their shareholding 12 months ago, Ineos Sport had no real control over football matters until the end of the season, when they appointed their new management team (who technically all work for Utd, not Ineos).
Two of those 7 Nice managers were stand-in caretakers, appointed when a manager was sacked halfway through the season.
So by your reckoning, they've been through 3 managers at Utd , in the 8 months they've been in charge.
At Nice, they inherited their first manager, Patrick Viera and gave him time, but after 18 months he had to go..
The first season was uninspiring, but after dismal results in the first half of the following season, they decided to sack him.
A caretaker manager (Ursea) was brought in to complete the rest of the season.
Galtier was given 1 season in charge and finished 5th in the league.
He wasn't fired.
He left the club when PSG poached him at the end of the season.
They then brought back a former Nice manager, Favre, but he was a disaster and was sacked in the January of his first season.
The reserves manager Digard, was asked to step in and fill the post until the end of the campaign.
A full time manager, Farioli was signed at the end of that season (2 year contract).
The team started the new season positively, but it went downhill after the New year and they ended the season poorly, so off he went.
The current manager, since last summer, Franck Haise, has turned Nice's fortunes around.
They are currently 3rd in the league, in a CL spot, with 10 games left.
Just 3 points behind 2nd place Marseille.
PSG with their €€millions, are runaway league leaders, as usual.
Haise is the 4th manager appointed full time since Ineos bought the club.
They have sacked 3, one of which, Viera, who they inherited and didn't appoint.
One left to go to PSG and their 4th appointee is doing well at the present time.
Note also, Nice's heyday was in the 1950's.
For nearly 60 years since, they've been a mid to lower league team, with a few spells in the 2nd division.
Before SJR took over, they've only had a few fleeting moments of finishing in the top 6 or getting to a cup final.
Looks like they're now making progress.
.