I see that with this defeat, Chelsea's chances of leaving the Premier League have increased to 1 in 51 
This is a small chance, but for comparison it is 1 in 251 for United and 1 in 501 for Brighton. But at the same time, Chelsea still has a good chance of entering the top 4: 1 in 5. This is only 20%, but is this not enough for a dream?
I don't know how long the crisis in Chelsea will last or how quickly it will end, but it looks like their fans will mostly suffer.
I have just understood that that from last season that Chelsea changed their management and also change their coach, the blame of non-performance has always been on the coaches and not on the Chelsea management, neither do we have them on the individual players. Some persons have begun to say that pochettino is not a good coach that he needs to leave Chelsea. This is a small chance, but for comparison it is 1 in 251 for United and 1 in 501 for Brighton. But at the same time, Chelsea still has a good chance of entering the top 4: 1 in 5. This is only 20%, but is this not enough for a dream? I don't know how long the crisis in Chelsea will last or how quickly it will end, but it looks like their fans will mostly suffer.
If Thomas was not a good coach and also Graham Potter was not a good coach then we know that Lampard was not a good coach and pochettino also is not a good coach who then will be the best coach for Chelsea?
Good question. Chelsea had a kaleidoscope of both coaches and players (who were selected not by the coaches but by the management), so the blame can safely be laid on the management. Another question is what to do about it. If you fire Pochettino now, the kaleidoscope will continue; if you don’t fire him, then maybe Chelsea will lose their last chance to rise from the depths to at least the Eurocup zone (I’m not talking about the Champions League, but at least the Europa League).