There's a danger of false equivalence though. Football isn't played from the repeated positions and scenarios of sports such as baseball. A percentage increase in points may be there if you look for it but unless you can repeat those same games without Doucore then it's very difficult to seriously argue he's definitely the cause. You can however point to obvious weaknesses or strengths in his performances.
There's also a legitimate concern that you're hitting a glass ceiling with limited players like Doucore or Gueye in and around the first team. They're both players who are fading physically and I'd imagine are only going to struggle at top flight level going forward.
Not sure you can use Brad Pitt and a made up number to show he clearly makes a difference that is statistically significant. A big reason the 'Moneyball' Oakland team was successful is that they had traditional star players in that team and the whole Moneyball legend is fairly exaggerated on the back of a narratively unreliable movie that ignores a lot of facts in favour of dramatic license.
Taking into account statistical data as part of scouting a player is nothing new. They're a useful tool to identify a player worth looking at but not something to base a decision on.
Yea that's really interesting mate, lots of food for thought.
You are right, I think football is very complex, and it's difficult to prove with absolute certainty. But there is quite a large dataset with Doucoure now. It could be coincidence, but in general I think things are coincidences.
Re ceiling, yes totally agree, their best years are ahead of them. In fairness to both I think they've added things to their game to ensure that the fall off maybe hasn't been as dramatic as it could have been, but we are defenitely losing value all the time with them. I do think you minimise that if you utilise them correctly, with good rotation. A lot of that drop off is physical, and you probably see it with both when they are flogged every game. I think this is a big problem of this manager as well, who doesn't really rotate either in game or game to game well enough.
In terms of Moneyball, in fairness I made a number up as I can't be bothered to calculate it, but what isn't made up is we do significantly better with Doucoure in the team than out. And the difference is statistically significant. You can make the case it's not really relevant to Doucoure, which is fair enough and probably fits the "eye test". I'm more inclined to follow statistics, which is a broader philosophical thing. I'm not saying I'm automatically right and another view is wrong, but the team is statistically better with him in it.