Chelsea's lack of leaders has been evident for a while but perhaps never more so than during this run of games under Graham Potter. Questions have been asked of the manager himself and whether he is the right person to motivate groups to win but that is largely besides the point.
Roman Abramovich's successful Chelsea model was supported by a core of strong, powerful players with the ability to effectively govern themselves. Over time they have left the club and very few have come through with similar attitudes, making it harder to manage.
Even throughout the club there has been the gradual decline of people that have a lengthy connection to the Blues. Petr Cech and Marina Granovskaia were moved on over the summer from their senior director roles, as was Bruce Buck. Even at squad level Jorginho - the vice captain - left in January.