For the 28-year-old, rugby is the vehicle which would now take him forward.
The league World Cup doesn't rate for a worldwide audience. Only three nations have won it since it began in 1954, Great Britain last breaking the stranglehold by Australia and New Zealand in 1972.
The NRL is big in Australia - particularly Sydney - and to a lesser extent New Zealand, but doesn't rate anywhere else.
Rugby, however, will take him places, including South Africa where Williams has a fast-growing and loyal fan base.
It would give him a truly global stage - the 2015 World Cup in England will be the biggest yet and the Rio Olympics offers an even bigger platform a year later. It also dovetails nicely with his boxing.
Playing in the midfield for the Chiefs isn't as physically taxing as playing second row in the NRL. The season isn't as long, and there are more opportunities to get in the ring. It's a win-win, something Williams has become adept at contriving.