I wouldn't say he played "vey well" unless you mean relative to Lebron. I'd be very disappointed if he averaged 10 points a game with his turnovers offsetting his assists and steals. He definitely needs to learn to play without the ball. Standing outside the three-point line and frantically waving his hands to call attention to a teammate across the court is not what playing without the ball means. More positively, I thought he played a lot better defensively last night (as, more surprisingly, did Kyrie). Smith made some tough shots off him, like the jumper from the free throw line.
I think, at least hope, that Dion will evolve into an efficient 15-points-a-game scorer and a lockdown defender. He has the tools physically to be a "very good" basketball player. Whether he has the emotional tools remains a big question, but it seems to me he's growing up.