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PREREQ 101
There are many, many, MANY baseball players who can play very, VERY well for 300 AB's, Capt. Lassard. Jarrod Dyson is one of those guys who is a role player who pro-rates to 3.0 WAR. Pro-rate@ But many is the role players cannot handle the heat and the burden of the scout/video day, or at least who can't stay healthy over the course of 162 full games. Hence the fact that we bloggers were guessing at 2/$21M for Dyson in Seattle, while GM's smiled and sobered us to the reality of his 2/$7.5M in Arizona.
Dyson did look like 3.0 WAR full season when he was in KC, and a-l-l of us bought into the dreamy aspirations of having a Loftonesque bullet train out there in CF for us, but the Royals knew better. Happily, they lightfingered our back pockets for 4 years' worth of Nate Karns - they'll underpay him for 2017, 2018, 2019 and 2020 while Dyson's 2.1 WAR has arrived, checked in, and checked back out.
Karns had an off year last year, meaning his ERA+ was merely 108 and his K's merely 10.1. Not that the M's couldn't use a 108 pitcher, but KKKarns is going to get better from there. Your big clue is 10 strikeouts per game, just to letcha know.
Prereq 101: don't assume too much about taking a good 240-330 AB's and doubling them at your leisure.