I just checked in with Tankathon, and in my first click, Boston got the 2nd and 9th pick, along with the Clip pick at 18 and the Celtics pick at 23.
If Boston hits its 2% chance to get pick 2-4, I can't imagine the Pels not trading Davis to Boston, even without Tatum in the deal. If the Lakers get lucky and get hit their 2.5% (and rising) chance at number 1, Davis will be a Laker, assuming Malinka prefers Davis over LeBron 2.0 being groomed by LeBron 1.0.
I value the MEM pick higher as a trade asset if it doesn't convey this season, but if it does hit, Boston will have as trade assets a 9, 14, 18, and 23. They would have ammo to move up, or to trade for a player or two that the Pels covet.
If Kyrie bolts, the Cs have four chances to land a future all star as they build around Tatum and Brown. Kyrie leaving would be disappointing, but that's not a bad floor.