I don't want to get too far into the discussion of the change in the club's shareholding from Abramovich to Todd Boehly. But too quickly sacking Thomas Tuchel in my opinion was the Chelsea club owner's initial mistake because Tuchel when compared to Potter was still too good for the German passport coach.
It is understandable Chelsea's performance against Manchester City because it is only an FA CUP status, but what if these conditions occur in the biggest competition such as the UEFA Champion League later against Borussia Dortmund?
Tuchel is far better than Potter, just look on their both achievement of their past clubs they've coached.
Potter coached:
Ostersunds FK since 2011-2018, carry this club from Superretan to Allsvenkan (success)
Swansea City 2018-2019, downgrade this club from Premier League to League One (failed)
Brighton 2019-2021, make this club in stable position 15-17 (neutral)
Tuchel coached:
Borrusia Dortmund 2015-2017, upgrade this club from 7th position to 3rd and 2nd position (success)
Paris Saint German, upgrade this club from 2rd position to 1st position for 3 years (success)
Don't give any excuse like it's just a FA cup, it's just a Premier League etc etc, the thing is Chelsea use their main line up while Manchester City didn't even let Haaland play. We need to judge based on the players, not from the league.