I'd definitely take a shot on Cousins.
The guy has the kind of building block talent that you hope to be lucky enough to get in the draft. Yes he is a head case, but the only reason talent like his is available is because he comes with risk.
If we could flip Jordan, picks and one of Sully/Bradley for Cousins we would be seriously vaulting ourselves back towards contention.
We keep Green and Rondo happy since we aren't going into full rebuild mode and we have a crazy young team that will be fun to watch.
Yes it could be a train wreck, but so could our responsible rebuild plans. I'd rather take the chance on talent. At least it will be fun to watch.