I was messing around last night and will keep it simple

Isaiah 33  mpg
Bradley 30 mpg
Crowder 29 mpg
Amir Johnson 18 mpg
Horford 30 mpg

15+18+19+30+18=100 minutes to distribute

Smart 25 mpg
Jaylen 20 mpg
Rozier 15 mpg
Green 15 mpg
KO     15 mpg
Zeller/Jerebko 10 mpg

We are going small a lot but Crowder should be playing the 4 some anyways.  As long as Horford is getting time each night crowder can slide to PF and do some things..  Jaylen is going to play there too.  The rest of the backup minutes will go to KO and either Zeller or Jerebko.   Smart, Jaylen and Rozier get the most minutes.  Young, Jackson and Mickey ride the bench barring injury and late game blowouts. Smart may come along slowly but he and Jaylen should be 1 and 2 off the bench unless Rozier or one of the other guys really starts to step forward.

Smart can really play 1-3 and should be the primary ballhandler off the bench.  Jaylen can play some 3 and 4. Olynyk can play 4 and 5 etc.. Green 2 and 3. Rozier is a 1-2.   He can slide to the 3 but that's going really small.  Bradley can do that moreso as a 2-3 along with Green.

Green will ride the bench for stretches this year I feel.  Jaylen could do the same but I hope not.  I hope he plays every night.  Rozier is the primary shooter off the bench.

Minutes will fluctuate from game to game more or less but that's pretty much it.