Almost positive that once terms of a trade have been submitted to the league office, the terms are final and complete. The only way the C's could change the terms of the trade would be to create another trade that changes the terms of the first trade.
So Boston and Philly would have to complete a trade where if the Lakers pick doesn't convey to Boston based on the terms of the original trade, the pick would convey to Boston no matter where the pick lands in exchange for....
What that exchange is would be important. My guess is it wouldn't be for just swapping the 2018 conveyance for the 2019 Sac. conveyance. Gotta remember, the Sixers could still end up with the 1st pick this year and the first pick next year. Gonna take a lot to have them give up that chance for the Cs to get the LA pick this year.
Well, that wouldnít change regardless.
Cís canít get the first this year or next year. This years pick and next yearís are top 1 protected.
In this hypothetical scenario where we want the 10th pick, we would obviously wait to make sure itís not 2 or 3, which would automatically convey. Once its revealed the pick is in fact #10, Philly clearly doesnít have a chance at the top pick. The Celtics could trade the Sac pick back to them for the 10th pick, but I donít see why they do that unless there is a player that drops to 10 that they absolutely love.
Next year with change the the lottery system that Sac pick will be interesting. Would suck if they somehow win the lottery and we get stuck with the Sixers 20+ pick.