decga, you can't just use a player's fielding percentage as the basis of whether a player's attributes should be increased or not. For instance, his UZR/150 is a good +9.1 over his two seasons (tied for best in baseball for RFs), while his ARM rating was bad (-6.5, which was good for 14th in the ML). His RngR (range runs) was a good 21.0 (2nd in the majors) while his ErrR (error runs) was a below average -1.7 (15th in the league). Remember these are all compared to other RFs.
Just looking at this, he has a below average arm for a RF, has good range, makes slightly more errors than his RF counterparts. He's a good fielder, but his attributes shouldn't go through the roof solely dependent on his Fielding%, but they should be increased a little, especially his "fielding ability" and "speed".
Jason Heyward stats: http://www.fangraphs.com/statss.aspx...40&position=OF
Fielding Leaderboard for RF: http://www.fangraphs.com/leaders.asp...rs=0&sort=21,d
Glossary: http://www.fangraphs.com/blogs/index.php/glossary/

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