Sacto isn't making the playoffs. The Celtics will have to get lucky with the ping pong balls, or hit a home run with the 13th or 14th pick. There will be a race to the bottom for the non-playoff teams who control their number one pick, so the Kings, like the Lakers last season, have no tanking incentive.
Fox suffering a season ending injury is the best way for the odds for this pick to improve. Even if the bottom does fall out, they already have more wins that the Knicks, Suns, Cavs, and Bulls will probably get all season, at 23.
The Memphis pick not conveying probably has some trade value in the future, like the Nets pick had. Philly got a nice prospective haul for the 10th pick in the last draft, moving down six spots and getting a future first. If this does convey at 9-11 in 2019, Ainge can spin it into something.
It seems like the 3 later first rounders for a high first type trade is not in fashion anymore. If some team is at 4 in what's perceived as a three player draft, maybe they would rather stock their roster with three first rounders and increase their odds that one of them would break out, than invest in one player. Boston is going to barely have roster room or court time for even one first rounder.