There are obviously a plethora of factors dictating the outcome of a football match. However, to dismiss the importance of the findings here as insignificant is stupid.

To continue the Ramsey example: he played with Arteta and Song partnering him in the majority of his starts (who both had significantly higher win percentages when featured in the team), but still failed to impress. You therefore can't blame his partners. He also started in games ranging from little importance to those of massive significance.

Again, I will reiterate my point, but I'll expand on it in hopes that you understand. These sorts of statistics show the type of impact, whether positive or negative, players have on their teams. From these findings, you can delve deeper and see exactly why players seem to have such effects. What is telling in ramsey's case here is the adverse affect his playing style has on the team. If you watched many of his games, you probably noticed his affect on the team's fluidity, and his apparent inability to fit into the team's system successfully. When ramsey plays, attacks become slow, we become less penetrative, and less cohesive as a unit. As a result, the team does not play as well as it does when ramsey doesn't start.