Some people confuse talent with flashyness, kids like Dvorsky, Leonard or Benson have alot of talent as well, with a grit factor to their game. The physical side of the game is very important when you climb up the levels, you need to win puck battles, so is your 200 ft work. There is no issue in that regard with those kids, what cant be said about Smith.
Smith's concerns are legit and you have to factor how his offensive numbers got inflated by the quality of his linemates and his 1-way commitment.
There is a huge gap in term of strength/power and 2-way commitment, not even close.