It was actually for Portland but Houston might work. It was like Ochai, a Cleveland pick back to the Cavs, and they would get Nurkic for Jarrett Allen. I suppose you could sub in KO... so KO, Cavs pick, Ochai to the Cavs for Allen... who we send to Houston and come away with the #4 (In the Portland thing I gave up the #9 as well).
Here is my semi-bold draft prediction. Houston take Whitmore, and Detroit takes one of Hendricks or Walker... and Amen falls to #6. That is the place to trade up imo that provides the most benefit and the cost may not be crazy.