That's exactly how I see it.
I'd love to be able to keep all our youthful depth. Depth is an important aspect of continued winning, but we have such a glaring weakness on this team, that we simply have to trade from strength to improve our weak area: pitching.
I think the defense will improve without any outside additions, as long as we can stay healthy at middle infield. It may never be great, but I actually think the team defense could be near plus, if Story, Mayer and Rafaela stay healthy, all year.
C: Wong, ___, Teel (minus)
1B: Casas, Romy (minus)
2B: Story, DHam-Romy (PLUS)
SS: Mayer, Story-DHam (plus)
3B: Devers (minus)
LF: Duran, Ref (PLUS)
CF: Rafaela, Duran (PLUS)
RF: Abreu, Rafaela (plus)
DH: Yoshida, Ref/Devers/Casas
We should be plus or PLUS at the most important positions, except Catcher, and minus at corner IF, also.