Evaluating minor leaguers is difficult for anyone. BA is one of the most popular sources for many fans, but if you look at any past Top 100 list, you will find 10-15 guys who peaked at utility infielder. Really any job that involves predicting the future involves being wrong a certain percentage of the time.
As for Mullins, not sure how undervalued he is. He is a 24yo LHP who turns 25 n two months and has pitched 33 IP above A ball in which he has 5.3 BB/9. He might go on for a great career, but I am not so sure he is a hot trade commodity in 2025. Certainly not as a secondary piece in a trade for multiple years of a SP already valued at 3.9 bWAR in early July…