Yes, and I'm sure that as we get into next season, if Williams doesn't improve, he will continue to lose reps to KO and Crayton. Like you said... that was proven at the end of '09.
The reason that both the coach and the GM are coming out and saying that Williams is a starter is because both Jerry and Phillips know that if they hope to get anything out of Roy Williams next season, they have to continue to stand behind him. By doing that they keep his confidence up and keep him focused on being a primary part of the offense. He knows his '09 season wasn't what it should be and he should be working overtime to correct that. All it would do to say Williams has lost his job is stir up a bunch of crap that the team could do without.
When the time comes, if he still isn't playing well, then they will put in Crayton and Ogletree and play the best players. They have shown that. Right now though, standing behind Williams is the thing to do.