OC Westbrook's "improved" defense is really just over-aggressively going for steals. Often times, a better defensive positioning or cutting off drive is better suited than going for steals, as shown in today game vs Rockets.

Why not just have a 76 defensive player who blocks the view of the rim at all times

Western All-Stars hype up KD and Westbrook after the lob! - TNT

The Lakers dunk fest line against the Warriors (or a closer study of the Warriors interior defense, or the lack of it)

Westbrook Hits Clutch Triple to Force OT - NBA TV