Football is a team game shaped by the displays and decision-making of individuals.
One moment of brilliance or rush of blood can be the difference between ecstasy and agony, three points and none.
Recruitment business can deliver joy and disaster in equal measure, while tactical decisions define the performance of 11 men and impact the mood of thousands.
Few teams in recent years have walked these sporting tightropes on more occasions than Chelsea.
Having got through 13 permanent managers since the turn of the 21st century, with Jose Mourinho taking the reins on two occasions, a lack of continuity has been both a blessing and a curse.