This is an admittedly odd/unrealistic scenario, but I have a certain affinity for this lineup:
Marcus Smart
Klay Thompson
Jaylen Brown
Gordon Hayward
Anthony Davis
Presumably in this scenario Irving and Horford both bailed, we acquired Davis for Tatum, Yabusele, Williams, Ojeyele and all of our 2019 1st rounders, and Thompson was signed with cap room (shrug).