They did exactly what they were supposed to do-promote a top prospect. Every team does this, as in 100% of them. How did Dominguez and Spencer Jones work out for the NYY? Jackson Holliday for the Orioles? Keaschell for the Twins. Crawford, Painter, Crews, House, Frelick, Turang, PCA....
Give me a team, and I can find at least 2-3 prospects that either never worked out, or that took 1-2 years before they worked out.