I have the roster losing Banes and Smart
PG- Irving, Rozier, Wanna
SG- Brown, Nader*
SF- Hayward, Morris, Semi
PF- Tatum, Williams, Yab
C- Horford, Theis,
I'd actually look at trading Morris for a SG. Maybe to Heat with a pick for Winslow. Winslow has been stuck at SF since Heat have Waiters and Ellington. At SG he is better and would replace Smart's defense. Another option would be Alex Abrines from the Thunder if they lose PG he would provide 3pt shooting off the bench.
For Center I'd love to get Favors at the MLE but he is looking for 15 million plus. So fall back is probably Noel or Len.
Roster with these changes would be something like
PG-Irving, Rozier, Wanna
SG- Brown, Winslow
SF- Hayward, Semi, Nader
PF- Tatum, Theis, Williams
C- Horford, Noel, Yab
I could live with that roster as it has solid depth.