I think Bellinger is the big signing this team needs as in we need to do something to give us a boost in this window and a young(ish), left-hitting CF/1B checks a lot of boxes. There's risk for sure, but I think there is risk is not going for it now also.
He moves Kiermayer to a platoon OF, which is better. He can also spell Vladdy at first, which is better (I won't even fantasize about Vlad being for enough to play some 3B).
To this l we add a bargain RH DH bat (who ever doesn't sign elsewhere will be fine for us).
We have the starting pitching, bullpen and D. We have a very flexible roster and we have a better offense when we add Bellinger to our existing core. We keep our prospects this way too.
C - Jansen/Kirk/KF/Varsho
1B - Guerrero/Bellinger/Biggio
2B - Biggio/Schneider/Espinal/KF
SS - Bichette/KF/Espinal
3B - KF/Biggio/Espinal
CF - Bellinger/Kiermayer/Varsho/KF/Springer
RF - Springer/Varsho/KF
LF - Varsho/KF/Biggio
DH - RH FA + Springer/Vladdy/Bellinger/Kirk
It's a decent, balanced, flexible and deep roster. Much less so without Bellinger. We still have Martinez and Barger and others try to win a spot too.