Tatum, Brown, Morris, Yabusele, and Ojeleye/Nader is enough salary to acquire Davis right now (I don't know next summer with the salary increases how it shakes out). If Boston gets the LAL pick and it was traded after the draft so the salary could count, Boston could eliminate the last 3 (or either of the first two). Thus, Tatum, Brown, LAL is probably close to enough salary and probably gets NO enough value. So Boston would be Horford, Davis, Hayward, Smart, Irving with Morris, Baynes, Rozier, Yabu, BOS 18, Ojeleye/Nader, Theis, White, Allen and then whatever other free agents Boston added for the bench.
That is a championship level team, Boston isn't with the Zinger as even with him Boston isn't in GS' class even if Brown or someone else could be held back for value (the Zinger will require at least LAL and 1 of Tatum/Brown).