Jason Vosler, 3B
In terms of performance relative to age relative to level, Vosler is roughly the equal of Mark Zagunis, ranked ninth in the organization by Farnsworth. Both recorded roughly equal walk and strikeout rates this past year at High-A Myrtle Beach. Both exhibited at least average power at that level. Both enter their age-22 seasons in 2016. In fact, Vosler likely has the advantage defensively: while Zagunis recorded the majority of his starts in an outfield corner, Vosler occupied third base almost exclusively.
The difference, mostly? Pedigree. Zagunis was selected in the third round of the 2014 draft out of Virginia Tech; Vosler, in the 16th round of that same draft, out of Northeastern in Boston. Nor is that something one ought to ignore entirely — and Zagunis does possess greater speed and athleticsm. Still, with regard to those traits which both (a) can be captured by numbers and ( translate most directly to wins, Vosler is well-acquitted.
Here, by way of conclusion, is a 20-plus second video of Vosler homering on August 29th: https://streamable.com/q8i9?t=2.1