It wasn't just the sack given up by Williams, he also looked to struggle getting 1 on 1 push at the POA and took some poor angles when climbing to the 2nd level and in space.
I'm not overly worried about the sack, it was DeForest Buckner who I think is one of the best interior pass-rushers in the league, and it was only his first preseason game after all, at a new position no less.
Ultimately, I'm not worried given the circumstances, then again I never thought Williams would be a multi-time Pro Bowler like Smith/Frederick/Martin, so my expectations are a little lowered.
I do think he will eventually be as good or better than Leary, just with different strengths.