Players get stronger and pack on more muscle from 18-21. Even if he doesn't grow an inch the idea that he's done "growing" is preposterous. And right now the biggest knocks are he tries too often to play the hero and doesn't utilize his teammates enough, his shooting when he gets in tight could use work, and his decision making with the puck could use work. These are coachable deficiencies. Then you have the room for growth on the inevitable and necessary adaptation to NHL pace and size, he has room to improve his shot, passing, skating. Like just because some guys who are physically superior in their draft year stop developing doesn't mean all of them do. You're writing off a lot of room for growth under a pretty superficial rationale from a guy who decides to write up undetermined upside as "blasphemy"