I usually see Sano listed with a hit tool in the 4.5 to 5.5 range. 3 sounds awfully low.
The 3 is Sano current rating according to on http://mlb.mlb.com/m...ts/watch/y2013/ they say his future rating is 5 though. Might not have made that clear.
I wouldn't pay much attention to MLB's scouting stuff. If you're looking for the tool grades on top minor leaguers, BP has them for most of their top 10 prospect lists, and BA has this: http://www.baseballa...13/2614739.html