I am not really bias, most of the time i don't like Slovenian players and complain about them but Zoran is a pretty good player.
My report on him would be:
+ great defensive player, both off and on ball... I think he's allowed to play more with hands on defense here in Europe but I am sure he'd adapt to the NBA rules.
+ good in fast breaks.
+ great energy guy, with him you're are sure that you will get 100% in an important game or in a preseason game.
+ team player. He won't force himself on offense and can be effective even if not scoring.
- Shooting. Just like his brother when he first got to the league. He can make 5 threes in a row and then not make another in the next 15 tries... I am sure Chip would make him better.
- Ball handling... He's good at it in fast breaks, but on a set up defense, he can still turn it over. But it's not as bad as Danny's.
Right now I don't think he could replace Marco, cause Marco is great for the Spurs offense with his shooting, but he's a lot better than him on defense. But I would't mind him to be the 12th guy. But I guess he'd want some playing time, and in Europe he can get it, so I doubt he'll even come to the NBA.