Denver and Minnesota are the only other teams i could see making a legitimate push for Cousins. In the end i expect a package of Brown, Smart, Johnson, BKN pick to get it done.
Replace Smart with Rozier and add the Memphis pick/Young (Boston) and Collison/ (Sacramento) to the trade, and that's about a perfect trade.
Actually, this works out pretty well for all sides:
Boston: Boogie, Collison, Casspi
Sacramento: Amir, Brown, Rozier, Young, Brooklyn 2017 pick swap, Memphis pick, and I'd even throw in the Clippers pick if they'd need it to get this done
That'd leave us with a lineup of:
PG: IT, Collison, Jackson
SG: Bradley, Smart
SF: Crowder, Casspi, Green
PF: Horford, JJ, Mickey
C: Cousins, KO, Zeller
Just imagine the lineups we could throw out there!