That's a good observation. Even though he's been finishing better of late, he's not getting to the basket as easy as he was last year. Could be nagging injuries still having an effect. Early on, clearly there was a confidence issue as well but I don't think that's going to be a permanent problem.
Tyreke himself said defenses are playing him differently this year. So where he might have seen man-to-man coverage which he could beat easily last year and the defense was late to rotate, now they're either double teaming him right away or keeping an extra defender in the lane. Also last year he was playing PG next to a bigger guard for about half the season. This year even when he's guarded man-to-man, he's matched up against the opponents best wing-defender. Those guys are longer and quicker and much harder to get around.
There's often a big adjustment period for any player when the scouts figure out that they're going to be the focus of the offense and they start game planning accordingly. Even without the injury issues Tyreke was going to have to play differently this year to have the same success. The summer shooting regimen was a pre-emptive adjustment on Tyreke's part, but that's still a work in progress. His outside shooting has improved, but at the cost of scoring efficiency. He's a marginal three point threat now which he wasn't at all last year. The midrange game is key though.
Overall I'd say he's on track in his development. He struggled through the early part of the year, and the injuries made those struggles worse, but he's since returned to form and he's varying his attack enough to keep the defense guessing a little bit. As the shooting gets better, the lane will open up even more for him. But more significantly, I think, is that the team has to get better before Tyreke will be able to face the kinds of defenses he abused last year. Having another go-to scorer in Cousins is already having an effect and the next step is for our shooters to make more of their shots (or failing that, acquire some better shooters).