As a player rises in form and starts to consistently produce goal-scoring performances often there is both a positive and negative impact on the players around them.
Mourinho over the weeks has described Diego Costa as being certainly special, so have the likes of Cesc Fabregas and John Terry who have expressed the joy of having such an accomplished player in their ranks.
Of course, with goals, as Diego Costa has supplied, comes wins. Wins automatically raise spirits of all players and help give drive and determination to all players.
Players though can gain even more with having a player like Costa alongside them in the team. Players who compliment him especially have the opportunity to really produce for themselves some form and the same level of consistent performance.
Players such as Cesc Fabregas and Eden Hazard have shined under the new look Chelsea that has been fueled by Costa's very presence.
The simple radiation of confidence Costa has in his play has translated into the two players being more confident in their own abilities as well. Also, the lack of any doubt in Costa's abilities has also allowed the two creative geniuses to commit more vigorously to chance creation.
Hazard in particular has changed his style from being a winger-goal scorer to more of a chance creator with the objective to instead perform his trickery to feed Costa. This change in emphasis is one that has caused him to be freed up in his play due to the lack of pressure for scoring goals. Whilst his relinquished goal-scoring requirements have lifted his freedom, he simply doesn't have the same thirst for goals he had last season.
Mourinho has obviously changed his mentality somewhat but to the extent that he no longer is attempting to really go for goal. The clear reduction of attempts on goal has taken a slight dimension away from Chelsea's game that may be sorely missed upon big occasions or even, dare say, in the event of an injury on Costa.
Fabregas though has truly flourished with Costa. The Spaniard revels in the opportunity for creativity with the positional genius of Costa and the developing chemistry between them has already produced some extremely satisfying results for the Blues. Cesc's remarkable vision and distributional abilities met with Diego's stunning positioning and simple determination and perseverance for goals is a partnership that is the centre point to Chelsea's game this season.
By contrast there are always players that seem to be overshadowed by the success of another. Schurrle, for example, is one that I feel hasn't had the opportunity to really buy into the new Chelsea game. Schurrle hasn't quite completed the transition of Chelsea's attacking style meaning the German is finding it more difficult to apply himself in games.
He has struggled to adapt and the fierce competition with Willian for the right wing spot has caused him to recede in influence in Chelsea's squad somewhat.
Of course Diego Costa's presence and goal-scoring form is a huge contribution to the good form Chelsea have enjoyed and subsequently they have found themselves at the top of the table. Whilst many players have been given the platform to flourish, others haven't quite adapted. What is assured though, is Mourinho's faith and confidence in his side. The entertainment the boss has enjoyed over the past weeks has given the manager a great deal of belief in his sides capabilities and will be surely aiming for the top prizes.