The consensus is that the Rockets didn't move to get the No. 12, No. 16, and No. 18 picks just so they could draft three middle-tier first round prospects. They seem to have something else in mind, and that something else could belong to the Sacramento Kings. Ken Berger from CBS has a report:
Among several avenues the Rockets are exploring would be a trade with Sacramento for the No. 5 pick in a deal that likely would send Tyreke Evans to Houston, sources said. The teams have discussed several scenarios, and while one person briefed on the talks described the deal as "getting close," rival executives have gotten the strong impression that the Kings are steadfastly resisting the Rockets' overtures.
While three first-rounders is very, very nice, Evans is two years removed from being Rookie of the Year and there's sure to be a ton of talent available at No. 5. The Kings seem to be well aware that the will have to give up more to work this scenario out.
We'll probably hear more from the Rockets before the draft is over: Daryl Morey has already shipped two players in return for three others and two draft picks, and definitely has more up his sleeve.