It depends what we do in the offseason.
I think a very reasonable offseason would be trading Bradley and acquiring a power forward (Melo, Jamychal green, Dario Saric, etc etc doesnt really matter.
Then you have Thomas, Smart, Rozier, Fultz, Brown, Crowder, PF, Horford, Zizic, other bigs.
To start the season you would probably go:
Thomas
Brown or Smart
Crowder
PF
Horford
however, by the end of the year, Id fully expect that lineup to be:
Thomas
Fultz
Brown
PF
Horford