That rise from 7 HRs to 21 HRs and being a 4-5 win player doesn't reflect ascending to upside - of course, he's 24 so his prime is over.
Bradley is almost three years older than Bogaerts. Similar WAR, premium position, significantly younger, higher probability it will stick - decision is easy.
Since WAR (or a wins-above-replacement computation of baseball accomplishments) is how teams evaluate players (though they have their own ingredients to put in the soup), that seems fair.