Maxed out on his skating, not his physical development. Very rarely do you see a skater go from slow to fast based on physical development. On the rare occasion where you see a guy improve skating drastically, it's almost always because a skating coach was able to fix some of deficiency in technique or skill, like Raz not using his edges effectively.
Let's keep in mind his dad was 5'11 185 in his playing days and was also a slower player for his size. (There's your 20 lbs BTW.) Considering how much faster the league is now, the kid will have a hard time replicating his dad's success, which was basically a 50 pt/season player, which isn't bad for #17 OA, but like I said, this team is already too small, too slow, and too soft. Haven't done enough research to tell you what I want at #17, but this kid isn't it.
I expect #17 to be a bit of a reach with Draper's FOMO pick, lol. I'm hoping Stevie gets a bit more involved since this is a first rounder.