To what extent do you think the dynamic you are talking about is a function of the match-ups with Tejas?
As you suggested in the "How we beat Texas" thread, Scheyer chased Abrams very effectively for much of the game. The effort took its toll on the offensive side, in making it harder for Jon to run the point all game long.
Luckily, Nolan could step in and pick up the slack by running the point at a few critical junctures. As much as Williams has energized this team, he simply does not have the reps in game situations to step in and play the 1 confidently.
Maybe a lineup with Scheyer and Williams did not perform as well as a lineup with Scheyer and Smith. But maybe the root cause was not necessarily Smith or Williams, but a dangerous gunner like Abrams.