I believe this is how things will ultimately play out for the Bengals O Line
Yep. In the camp practice I saw last week, Ghiaciuc barely took a snap at center. Both Williams and Whitworth have been taking snaps at center. The issue with the move is twofold. First, though the team should be disappointed with Ghiaciuc's power in the middle, they like his mobility. Williams and Whitworth certainly have the power to control the middle, but may not have the mobility to consistently get out to the second level. However, if Ghiaciuc can't block the guys he can get to -- see Nick Barnett throughout the first quarter -- and can't get enough of an angle to control a defensive tackle without help -- see every CLE/PIT/BAL game over the past two seasons, his mobility isn't worth anything.
Second, it's rumored that there's some concern that Williams may not be able to handle the line calls. I have no idea if that concern is valid or not.
Anderson isn't what he once was.
I think the two best run blockers right now are Williams (who rebounded nicely last year after a pretty poor 2006) and Whitworth. Andrews is inconsistent, but may end up being the best of the group by year's end. He's stupid quick and nimble for a guy his size.