This shows that experience matters so much in handling managerial positions something I think Graham Potter is still lacking but I won't rate Manchester United to win the Europa league now because their are still good teams who actually match their stats still competing for the trophy.
Experience is important for everyone and it is not only important for football coaches. It's barely to see people with limited or without experience got great success with their debuts. People like Mourinho and Zidane who got great success in early careers and managed to continue it after that is more scarce.
We can look at Andre Villa Boas to see how it is very hard to maintain success for young coaches. After succeeding in Porto, Boas failed in Chelsea and after that his career falls down and has never returned to best coaches in Europe.
Graham potter is an unexperienced coach. Potter never coached the big club but he was always coaching the small club. The pressure from the big clubs are far greater compared with the pressure from the small clubs. That's why potter faces many difficulties to be a coach for chelsea but the problem is since potter lack of experience to handle the big club but he was still continue to handle it and bring chelsea to the bottom standing of EPL
Chelsea were impressed with Potter works in Brighton and they wanted to have a kind of sexy football in Stamford Bridge with Potter. That hope has yet become true and the reality in Chelsea is worse and worse. I did not think that Chelsea will fall to deep in Premier League like this and already say goodbye to top four in this season.
Potter can help Brighton to move to first half of table and compete for top six but when taking a coach position in Chelsea, he failed to cope with high pressure there.