I would disagree with you on he's doing the same things wrong. His individual defense is improved, his efficiency is improved, his rebounding rates have improved etc.
He plays 24 mpg and gets nearly a double-double. There are many teams that would covet him in a trade.
Honestly if this is how it's going to be in the Casey era, they may as well look into trading him since he's going to make 10+ million on his extension. Someone playing 25>mpg isn't worth 10 million per season