Ah, I see. Yah, it would be nice to see a what an entirely empirical prospect valuation model would say. It may very well agree with what you're saying.
Though, ZIPs and Steamer use minor league data, adjust for age, league, position and take some stabs at D value. They have his current true talent pegged as a slightly below average MLB bat with ok D at SS. That in itself is a valuable asset (2-ish WAR over a full season), but it's actually pretty in-line with what the prospect list model would say. Maybe a bit better.
2 WAR
2.5 WAR
3.25 WAR
3.5 WAR
3.75 WAR
4 WAR
Wouldn't be surprised if a multi-year ZIPs projection would look something like that.