60% may be his predicted mean, that his scores - taken as measurements - will tend to regress towards over time. However, that does not mean that there isn't an

60% may be his predicted mean, that his scores - taken as measurements - will tend to regress towards over time. However, that does not mean that there isn't an answer for why that happens; why he's a 60% shooter rather than a 70% one. Even if it's just an unsatisfying answer, like he's genetically flawed and was getting tired or something like that.