I agree he looks less explosive. That first step just isn't as crisp. Really it was that "first step" plus the step back jumper that BOTH got added to his game last year that really elevated him. Feels like it took a while for teams to adjust to defending him but they are getting better. Harden is still a terror in transition, but defenses are getting better at defending him in the ISO. Feels like ever since that failed ISO drive in the GS WCF game 2, Harden just hasn't been the same with that explosion.
There's more than a little sample size issue with that stat. That's basically one or two games worth of shots.