Here's some data for the top rookies by minutes played. I used 400 minutes as the qualifier, but included Harper because I wanted to.
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If the season ended today I would go with ROY:
1. Kon - USG% + TS% + positive on/off net rtg put him over the top for me.
2. Flagg - Shear total usage, but Dallas being 9.5pts better defensively with him off the court is interesting.
3. V.J. - Mostly due to how much he seems to be impacting team off/def, TS% is concerning
Rest of the first team Rookies:
4. Queen - Counting stats/36 and on/off impact
5. Coward - Really solid numbers across the board
Second Team all rookie:
6. Harper - Probably first team by the end of the year, but has played less minutes
7. Ace - Probably because I'm a homer
8. CMB - Best DEFRTG and improves the defense while on the court on a very good defensive team.
9. Fears - Putting up stats, but hurting team, but kind of expected for a rookie guard
10. Egor/Tre - Not sure who I would put here yet.