Over the last 25 years, how many defenceman do you think could should the puck like this ?
Does that look like luck or did he just not shoot a lot and he has an elite shot ?
His shooting percentage is bound to go down, for sure. But his shooting will go up considerably with a) more playing time and b) getting better. His shooting percentage will always remain high, probably around 10-12%. Even going down to half he still would've been on pace for 10 goals which is still a very good season for a 21 YO defender with less than 100 games in the NHL.