CsBanner18: I really like your idea.
I've mentioned in past posts that Cousins is a guy that I suspect may want out of Sactown next year if their team is still in the toilet (which by the way is another reason I wouldn't want to trade Rondo there.)
I don't see this happening before or during this season, however I do possibly see the following happening:
-Celts end up with a top 3-5 pick for next season (and for all we know, DA and Rondo have worked something out where they expect the team to be bad for one more season and then the fireworks really begin.)
-Not only does Rondo not get traded, he re-signs in Boston beyond next season
-Sacramento misses the playoffs again, they can't acquire any star talent and next spring Cousins tells them he wants out.
-The Celts come charging in with their assets headlined by their lottery pick next season, and the Celts/Kings make dance partners over a Cousins trade. Cousins has also said he thinks Rondo is the best PG in the league so why wouldn't he be interested in Boston?
Long story short, tuck this idea away for a little while, hopefully it becomes reality next spring.