Kyrie involves his team mates as much as IT did. If you check their assist% to usage% ratio, they are almost exact.
They’re close, but there’s at least some evidence that IT was a slightly more willing passer:


If you take these dtats and then adjust them for minutes played and usage, it gets very, very close regarding who was the more willing passer. Remember Isaiah played 2 more minutes per game and had had a 34% to 31% usage advantage.
Closer, yes, but I do think that last year's offense had a little more ball movement and IT found his teammates in better positions to score.
Like I said, it's a slight difference, and when you consider the situation both guys were in -- alpha dog with no elite second option -- both guys have combined scoring and efficiency in an amazing way. But, in terms of skills, I think IT was a slightly better passer.
But, even while acknowledging that slight difference, the two guys play the game in very similar ways. The only real difference is that IT got to the line more.
I agree with almost all of this but would also add that IT was playing in the 3rd year of the system with players who had been in the system for years. I think as the years go by and Irving is playing in the system more and gets familiar with his team mates, the passing difference will disappear.
I find both players very similar and love both of them in the Stevens system. The only major difference I see is Irving's ability to play better defense...when he wants to play defense, which so far this year, he has done.
Oddly, both Kyrie's passing and defense have gotten worse as the season has progressed.
Oct: 21.7 points, 5.7 assists, 3.7 rebounds, .543 TS%, 29.1 USG, 97 DRtg
Nov: 24.1 points, 4.9 assists, 3.1 rebounds, .612 TS%, 32.2 USG, 104 DRtg
Dec: 26.9 points, 4.2 assists, 2.0 rebounds, .641 TS%, 33.7 USG, 115 DRtg
What's the narrative there? Is it that as Kyrie becomes more comfortable, he reverts more to a scorer? Or that since his shot has been falling at super-efficient levels, he's been more likely to keep the ball? Or is it that Kyrie is naturally exerting less effort as the season goes on? Or is it just due to variations in the schedule?