Small sample size.
If just 4 more of Jae's 44 three point attempts had stayed in the net he'd be shooting 38.6% and none of this discussion happens.
Ironically, this thread came out just as Jae finally had a decent game, posting 15 points, 7 rebounds & 3 assists against his old team (DAL). Also ironically, he did so not by hitting threes (he still shot a poor 1 of 6 from the arc), but rather by going to the hoop and getting to the FT line (6 for 6).
I think I'll wait until we get a little deeper into the season before I crow too loudly about Jae's supposed decline. A dozen games to start the season is usually a bit too early for epitaphs. 'Not claiming he'll not still end up with a terrible year. 'Just think it's way too early.