Yes he has. Along with the highest TO rate and PF rate (per 100) of his career, and his lowest AST rate since 13-14. That last bit shows up just as clearly in his AST%, which is his lowest of any point in his career. Or how about the fact that a pathetically small percentage of his 2P shots have been assisted (29%) compared to about 45% for the rest of his Spurs career? (Which means the ball isn't being shared while he's on the floor.)
And the numbers don't even take into account the fact that he coughs the ball up under any sort of ball pressure, so he has to dump it off to someone else (which kills offensive flow). More than ever, he's become a very-undersized 2 guard who is functioning (not functioning) as a PG. On the nights when he's hitting lots of shots, its easy to defend him. The rest of the time, he's a losing proposition.
We're only 5 games in, so things will change - whether for better or worse. But so far, he's looked like a slightly worse version of something I was already sick of. Even so, I'd rather have him on the bench than Beli.