I don't know what he did in the offseason or if he'll eventually come back down to earth but he's improved so much as a shooter this season it's absurd. He's just like DeRozan, if he shoots it, it goes in.
The offseason weight loss has also improved his mobility tenfold & he clearly worked a lot on his handle this summer. His Iso-Game is god-tier because of it & he isn't turning the ball over like in years past. Only 3 TOs per game during this 9 game win streak.
Oh and the biggest factor. CP3's arrival has lessened his workload. No more carrying bums to dubs like in years past, he finally has that Superstar teammate he's always lacked since he got here.