"And I think that's always a healthy thing to have. They've brought a different perspective to it.
"To be honest they're just very good guys, they've blended in and have become leaders very, very quickly."
Ulster finished second-from-bottom in last season's Magners League but Williams reckons they could find themselves at the business end of the table come May, if they can find that elusive streak of consistency.
"The Magners League is a very open competition. Leinster were very worthy winners last season. It's going to be important for teams to get consistency and then how you go from one competition to the next.
"How you go from the European Cup and come back to the Magners League and you can't afford to take two or three games to get back into the swing of it and the same thing will happen with the Six Nations. That's the nature of a rugby season.
"It's broken into three or four different sections and you have to be strong in all of them," he added.