Reasoning:
The Clippers do this to finally get the all around offensive PG they have been looking for. They also form a big three of Kawhi, PG13 and Kemba.
The Celtics to this to move on from Kemba who hasn't been great for them. In return they get Zubac who would help them round out there depth at center, Luke Kennard a great shooter and Patrick Beverley who would take Kemba's starting role.
Rotations:
Clippers= 1. Kemba Walker 2. PG13 3. Kawhi Leonard 4. Marcus Morris 5. Serge Ibaca
Rondo 2. Reggie Jackson 3. Terrance Mann 4. Nicholas Batum 5. Bismack Biyombo
Celtics= 1. Pat Bev 2. Luke Kennard 3. Jaylen Brown 4. Tatum 5. Zubac
Payton Prichard 2. Marcus Smart 3. Evan Fournier 4. Jabari Parker 5. Robert Williams