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.

James Harden defensive play of the year candidate - wait for the replay

A quick look at Klay vs Westbrook's stats

Josh "Clamps" Okogie goes full-throttle against Jazz's lax defense to score a quick lay-up.

Westbrook with 19113 and 1 steal in a 14 point loss