I watched one of his earlier games, where he had 5 or 6 To, plus vs Kentucky early in the season and he was out of control a lot of times. Yesterday he played Villanova, who is an elite team, that can throw a lot of solid defenders of his size at him, so he didn't really shift defense, since Villanova was content with mostly single coverage on him, and Derosiers, shooting big, with whom Dunn often initiates offense off of P&P, wasn't playing great, or at least Villanova defended P&P very well, since they switch easily, but Dunn still got his 9 assists. Yes, there were a couple risky passes, that were picked up, but he was driving his team's offense all by himself. And comparing junior seasons for him and Payton:
per 100 possessions
Payton - 30 points on .551TS%, 9.4 rebounds, 9.3 assists, 5.7 TOs (1.64 ast/to ratio), 3.6 steals
Dunn - 28.5 points on .551TS%, 10.0 rebounds, 13.6 assists, 7.3 TOs (1.86 ast/to ratio), 5.0 steals
At some point ability to create bigger chunk of team's offense has to count for something. Then you get to notice, that Providence had 8th SOS in the country (would've been 4th last season), while ULL's was in the middle of second hundred (kenpom.com), so Dunn is clearly a superior offensive player, coming out of college. As for defense Payton is quicker, but Dunn is longer and is clearly capable of defending the ball. Anyway Orlando is allowing 1.08 ppp with him and 1.10 without him, so it's not like Payton has shown to be a really effective defender so far, it's more like he has exciting defensive possessions from time to time.