By all accounts Boogie isn't available so this discussion is pointless.
However were he to be made available, you pull the trigger on a trade because the guy is a transformational talent entering his peak years. Furthermore, he fills about the biggest whole the Celtics have and fits well, on paper, with the rest of the roster. There are concerns about his behavior but the Kings are almost the polar opposite of the Celtics in terms of stability, team culture and the number of former players who are around the organization to support their rich history. I know they aren't similar personalities but there were questions about KG when he came to Boston and he embraced being a Celtic to his core. We don't know if Boogie would do the same thing but given the strength of leadership at the top of the club, the odds favor that outcome.
As you guys may have surmised by now, I am irrational when it comes to Cousins to Boston scenarios so I will stop here. However there is no better potential trade this year than Boogie to the C's. He fits, they have the assets to get it done and he finally gets to play for a GM, coach and team that has a real plan. However Vlade seems intent on keeping him...for now (fingers crossed).