Only problem with him "still having it" is that defensively he was a massive drop off from what he used to be. Not necessarily for lack of effort (Harden) but just from age he had fallen off.. Comparable to how the same happened with Ray Allen.
That and you would assume his speed, quickness, vertical, durability, etc has gone down, it only makes sense for his rating to not be amongst the 4-5 best players in the league. With that being said if he regains his form and is the player he was before the injury I'll be ok with the 89 rating.
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