I'm sure if there was a third team something could get done. Was remembering Kings, and Pistons trade talks as well as C's and Pistons dealings. Perhaps the following would appeal to the teams.
C's trade: Rondo, Fav, Wallace.
C's get: Monroe, McLemore, J.Thompson, Williams, a 2nd.
Kings trade: Stauskas, McLemore, J.Thompson, Williams.
Kings get: Rondo, and Wallace.
Pistons trade: Monroe and a 2nd.
Pistons get: Stauskas, and Fav.
Celtics new roster
Starters: Smart, AB, Green*, Olynyk, Monroe*
Bench: Turner, Pressey, McLemore, Thornton*, Young, Williams*, Bass*, Powell, Thompson, Sully, Zeller
*= Guys with one year left likely. Hopefully team resigns Monroe which I don't see why not given cap space on team and his best position is Center.