It comes down to if the Nats want to keep JZ for another season and take the two compensation picks or sift through other teams's system to find desirable and more MLB ready prospects. Keeping Zimm around for one more season would create ackwardness in the clubhouse because it would be in the back of everyone's mind that he would be leaving at season's end. However, Zimmermann looks to have reached the peak of career and may put up better numbers than even Scherzer.
With the Nats withdrawing their first round pick in order to acquire Scherzer, it'd be beneficial to go into the 2016 draft to make up for the lost picks from Type A signings. It'll be bittersweet for Zimmermann knowing he'll be playing his last season here, but it'll make the opportunity more compelling knowing when the window is going to be closed. Ditto Desmond.