Problem 1. Harry already recovered the sword under conditions of valour. He did that in Chamber of Secrets. How many times does he have to win the darn thing?
Each and every time, it seems, or Dumbledore wouldn't have made a point of saying so. (How did Dumbledore earn it to use on the ring? Would it not have worked for him had he not put the ring on and cursed his hand?)
As to problem 2: Severus' approach shows familiarity with Harry's thinking. This was the boy who got excited about Dumbledore *wanting* him to go down the Labyrinth because he had the *right* to face Voldemort. Harry approves of authority figures sending him into danger to achieve a goal he considers worthwhile.
Each and every time, it seems, or Dumbledore wouldn't have made a point of saying so. (How did Dumbledore earn it to use on the ring? Would it not have worked for him had he not put the ring on and cursed his hand?)
As to problem 2: Severus' approach shows familiarity with Harry's thinking. This was the boy who got excited about Dumbledore *wanting* him to go down the Labyrinth because he had the *right* to face Voldemort. Harry approves of authority figures sending him into danger to achieve a goal he considers worthwhile.