Empties are a pain and aren't needed, the tutorial is really just telling you how to make them in case you need to make them. I believe I read somewhere that they are automatically made.
I also think that you don't need to use dts collision, because bricks can be made with collision.
Bricks with Collision can only be in squares, and can't be angled I believe.
Also when I've forgotten an empty, I usually get errors in my console.
