Let us look at the Cubs current major league roster depth chart:
LF: Open
CF: Happ
RF: Heyward
3B: Bryant
SS: Baez
2B: Hoerner
1B: Rizzo
C: Contreras
SP1: Hendricks
SP2: Davies
SP3: Mills
SP4: Open
SP5: Open
Closer: Kimbrel
Bryant, Baez and Rizzo will be free agents after 2021.
Heyward and Kimbrel are untradeable due to their dead money contracts.
Even if you move Bryant to LF and Bote to third, how is this roster going to be any better than 2020?
Losing Lester, Chatwood and Darvish from the rotation is a killer issue. Will you go with inexperienced pitchers like Alzolay, Rea and Marquez to be placeholders?
The roster down grades are apparent in the OF, starting rotation, bullpen and closer.
With Contreras, Bryant and Baez being actively shopped by Jed Hoyer, who knows what dumpster fire will take the field during spring training.