My best guess, for tonight, is that when Castle picked up his fourth foul two minutes into the second half, SAS subbed in KJ - instead of Harper. NYK shifted OG to Fox, who was left to initiate without another ball-handler. OG ducked under a fair amount.
I'm still trying to assess if this is largely a symptom of a bigger problem (i.e., dearth of reliable on-ball creation), misidentifciation of who should've been the focal point, or both.