PG- IT (28), Smart (12), Rozier ( 8 ),
SG- AB (32), Smart (12), IT (4)
SF- Crowder (28), Brown (16), Smart (4)
PF- Horford (12), AJ (22), JJ/Mickey(14)
C- KO (26), Horford (18)
I don't really think among KO, AJ and Horford position matters much between PF and C.
We occasionally run some 3 guard lineups and play IT off the ball for a few minutes on offense. It allows Rozier to get some minutes, and takes advantage of the fact that Smart and Rozier are versatile defenders who can cover bigger players.
I expect Brown to be a major factor for the bench. Evan Turner's production will need to be replaced. Some of it will come from improvements from Smart and KO, but much of it will come from Brown attacking the rim against second team defenders. By the end of 2016, he starts to figure it out, and ends up scoring over 10 ppg.
There is room for JJ or Mickey to have a role, but not both. Mickey will get a chance, but if he hasn't won the job by the new year, the job is Jerebko's.