I'm not sold on any manager, for any team, being worth 20 wins. I'm also not sold on our next manager having significant impact on player development. The rest of the organization will have their thumbprint all over whose on the roster and how much they play.
We will get someone with little (Grady) or no MLB managing experience. They will be learning on the job and "growing" with the team. They will also be fired to appease the fans after two or three seasons. With little experience, and tiny pay, they are vulnerable and will do whatever Getz and Co. "suggest" to them.
The coaching staff, of which they will have little or no say in the hiring will have a greater impact.
For better (hopefully) or worse (likely) this will be Getz's fantasy team playing for real.