That doesn't disprove my point, since it's Tango's work... But the first part about not having the resources to extract data like the clubs is the important part.
I would agree with that. If they had the resources maybe we would have better data. However I tend to think most of the data that teams use is based on creating an on field advantage. Shifts, where to pitch, who to use, etc. I don't feel the actual performance is going to differ all that much to really matter. I think most models will show Ender as a plus defender in center. Neck being an average hitter this year, Freeman being really good, etc. Where things will differ is exactly how good that player is and how they value it. What is there value on left field defense compared to short or center, etc.