How Badly Do Houston Rockets Need an Upgrade at Point Guard?

The Houston Rockets have progressively built an elite team, but they are still one piece away from being a true title contender: They need an upgrade—or at the least, another option—at point guard. In 2011-12, the Rockets were just 34-32, and Luis Scola was their leading scorer. The next year, they added James Harden who has emerged as an MVP front-runner this season. Then they acquired Dwight Howard. This offseason they replaced Chandler Parsons with Trevor Ariza and revamped their philosop...