I thought it would be of interest to discuss service time management of other clubs. I will chime in with the case of Franklin Barreto of the Oakland A's.
He's 21 and ranked #40 by Baseball America. Had a solid season in AA last year (over 500 plate appearances). Very good spring training this year and off to a hot start in AAA.
The A's shortstop Marcus Semien broke his wrist and is out until June. So far the A's have opted not to call up Barreto.