Possible deal for Sabonis:
Celtics Receive: Sabonis (3/56) and either Justin Holiday (2/12) OR Torrey Craig (2/10)
Pacers Receive: Josh Richardson (2/24), Juancho (1/7), Grant Williams (2/7 + QO), Payton Pritchard (3/8 + QO), and unprotected 1sts in 2022 and 2024.
This is a quantity deal for the Pacers, but it could have some appeal. They don't have to take back any bad $ long-term. It gives them flexibility on whether to try and stay competitive or continue towards more of a full re-build. Grant as a role-playing 4 would be a decent option if they want to keep Turner and expand his role. Richardson and Pritchard could be rotation players for them, if they want to stay competitive and of course the prize is the 2 unprotected 1sts. If they want to really blow it up, they can continue to make deals with Turner, LeVert, and Richardson and acquire more picks.
Celtics would be left with:
Smart, Brown, Tatum, Sabonis, Timelord
Schroder, Nesmith, Langford, Holiday/Craig, Horford