Also of note is that our overzealous search for causality is not unique to making sense of coaching/athlete results, but rather an underlying element of our human psychology. This allows us to mislead ourselves into thinking we understand our world better than we actually do. https://twitter.com/LanginTots13/status/1295468081859293185
Having concrete data can feed into this pattern-seeking by providing our mind simple building blocks to construct whatever narrative it so desires. What makes it tricky is that we can't recognize these biases as the narratives we construct make sense to us.
A good quick read on this narrative fallacy, with references to relevant books, is available here: https://fs.blog/2016/04/narrative-fallacy/