One of the surprising thing is when I look up the advanced numbers, especially on the defensive end, is pretty bad. His Drating is at 123.7 and his mixed team defense stats (based on some counting stats) is at 33th percentile in the league. His shooting is bad pretty much across the board, and he has a high TOV%, which is expected for a rookie.
I still haven't figured it out, because watching the game, his game is quite advanced for a rookie, and he seems to be doing quite well, but the advanced stats don't reflect that, so i have to watch a bit more closely. I am still very happy with Castle, and think he is just a few minor fixes to be a star (shooting, defending without fouling, cleaner passes).