Williams, on as a replacement for the injured Jamie Roberts, scored the only try of the match to clinch a 19-12 win and with it Wales’ 20th Triple Crown after victories over Ireland in Dublin and Scotland at the Millennium Stadium.
“Scott is a very grounded guy, there’s no chance of him getting above his station,” said Scarlets Head of Rugby, Nigel Davies.
“It was a great game of rugby, very intense, and both sides really went at each other.
“And the Welsh back row were phenomenal, that is the part of the game that has changed over the last couple of years – it has become a martial art and those guys are black belts.
“It was a game which could have gone either way but a little bit of ability and a little bit of skill helps.”
And Davies also believes the huge success of the youngsters in the side is proof that the regions are working superbly in producing the stars of the future.
“You look at Scott, Alex Cuthbert, George North, Rhys Priestland and Sam Warburton – all those players were just playing within the age-grade regional game a few years ago,” he said.
“It shows the regional game supports the national game. In Wales the regions are not just a performance model, they’re a development model and it’s certainly impacted on the national team.”