[Abhishek R]

Like others have said, this basically boils down to quantitative (your mentor) vs subjective (the student) data. Like most things in life, the answer is usually some sort of happy median. The fact that you have someone taking such detailed notes on every team already is a great start.

Depending on who's doing the scouting and how, I think there's opportunity for subjective to be better than quantitative - statistics can't tell you everything.