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Your point is well taken about needing to factor in the defensive runs given away ... -5 or -10 or -15 runs per year, depending.
Dewan's plus/minus has him close to average in RF, -4 plays (not runs) in 500 innings, and most big OF bats are worse defenders than the table setters. The Brauns and Bautistas are never going to give us the defense of a Hunter Pence or Ichiro...
Also, Kemp's UPside has to be factored in; he slugged .600 in the second half and it was apparently due to figuring out his swing.
But yeah. A Giancarlo Stanton return on Matt Kemp at his contract ... I just don't get it ...