The Diamondbacks have been performing below their "true worth" for a long period of time. When the underformation becomes this duration, oddsmakers are usually backed into a corner and forced to overcompensate for such underperformance. This coupled with the notion that (altough has looked solid year to date) Feldman has overachieved and one is more than likely buying into "peak production" with him at this point and time, and I am not suprised my valuation model shows the Dbacks are undervalued.
Both starting lineup cards are materially less than top production, the the downgrade with both are rather commensurate (also shown by a lack of line movement the last 20 minutes).
The market appears to be seeing eye to eye with oddsmakers here.