If the Cs buy MIami's pick, package it with #19, Baby and a future first, that might be enough to get to #5 where we could pick Cousins. It's not out of the realm of possibility--it depends on what Sac thinks of Baby and what they think they can get at 18 and 19.
Cousins is ROY material and might end up being the best player in this draft. He needs the right environment to develop and I think he'd find that in Boston. A Rondo/Cousins core going forward is championship caliber, and we'd extend the BIg 3 window in the process.