I dont know if they help or not but they dont make him a worse player. He still is a 30/9/8 guy. Aslo while I understand the black hole concerns.. I'd like to point out that JC is worse as a black hole (not only passes less, assists less but also scores with lower efficiency). Yes, JC passes less. In fact both are -12 on passes made vs passes received but JC's percentage is much worse since Luka touches the ball way more.
They dont have a system like we do in Dallas, so its hard to say how he would adapt to Hardy's style but at the very least he is a GIGANTIC upgrade over JC.