The Arencibia's season in terms defensive was negative (between the incumbents of the same position). "Def" is set to the positional adjustment, the contribution looks positive because "the spectrum defensive or positional value"
Positional Adjustment:
C +12.5 for C
SS +7.5
2B/3B/CF +2.5 (********)
RF/LF -7.5
1B -12.5
DH -17.5
JPA vs RF/LF/1B/DH looks great.
JPA Vs the other catchers in the league looks like s***
http://www.bluejaysmessageboard.com/attachment.php?attachmentid=368&d=1380890898
He doesn't know the game more than us. Here are several people with sufficient capacity to write with more objectively that him.
Dingers+Ribeyes, Sabermetric, ********......No matter what.