fbalmeida wrote:
I'd really like to know what the metrics are on MLB prospects. Essentially what are the odds that a decent prospect can in fact become a productive everyday player/rotation pitcher?
Giving Stroman away for:
- A solid 18 year old prospect who in 5 years may just as easily end up in an all-star game, forgetting baseball to pursue higher education and a professional career, or anywhere in between;
- along with a 24 year old Anthony Kay, tossing 6.6 ERA in AAA (by comparison, at his age, Stroman already had 30 major league starts, 15-6 with a 3.32 ERA).
The easiest way to look at it is surplus value...ie., in the aggregate, the value of their production versus what they'd be paid over their years of team control.
This is where team evaluation gets a little tricky, though; using Fangraphs' numbers, the average by surplus value for a pitching prospect at the FV 50, 45+ and 45 level is $21m, $6m and $4m respectively. Right now, SWR and Kay are listed as 45+ and 45; that'd be about $10m in surplus value, where Stroman's worth about $27m (possibly plus a bit depending on how one values the possible comp pick).
So on that score, it's quite light. However, it's also pretty variable; if you rate SWR a bit higher, as a fringe top 100 prospect (and he might actually be that when the ratings are redone at season's end), you're now looking at about $23-27m...still not a spectacular return, but a totally acceptable one. This is why people need to be a little careful with rankings. It generally takes a bit for the consensus to catch up with results; Alford was still quite highly ranked despite performing miserably, and if you just looked at the rankings he was far more valuable than any rational observer would believe, until suddenly his rankings cratered (almost 18 months after the fact).