#1 Samuel Eto’o

Talking about cause and effect, this is where the cause had its root at. Pep Guardiola’s strenuous relationship with the Cameroonian meant that the legendary African footballer wasn’t going to be at Barcelona after helping them to a treble-winning campaign.
To replace Eto’o, Barcelona swapped him with Ibrahimovic – and then the wheel started to spin.
At Inter, Eto’o spent most of his time on the wings when not in possession. The former Real Madrid starlet actually sacrificed his own skillset to accommodate the more predatory instincts of Diego Milito.
You see, Eto’o was perhaps the better goalscorer too, but his supreme physicality and technical ability convinced Mourinho to play him on the right as a defensive-winger-cum-forward – and he carried it out to perfection.
Inter won the treble that season while Barcelona failed to overcome them in the semi-final. The Zlatan Ibra experiment also failed and David Villa was bought in the following season to be played on the left. After that Ibrahimovic when to Milan and then to PSG, which forced Cavani to play on the flanks.
Someone should make The Butterfly Effect 4 from these events.