That because Twal has no power, he's one of the softest runners of the football in the history of the NRL.
That's why he should almost never get passed the ball in the opposition 20. You know as soon as the ball's in his hands he's going to meander to teh defence, get dominated and get a very slow play the ball. Only if we're in a mess and just need someone to take a settler should he ever see the ball in the 20, and even then i wouldn't pass it to him if there were other options who can play the ball faster.