I would like to see a bit more info on this too. This is interesting news (and is corroborated by a couple of Bills sites/fan boards I have looked at today), as I assumed Searcy would just lock up the job. I think Williams is less of an 'in the box' type safety than Searcy, so maybe his fantasy upside/tackle opportunity will be a little lower than if Searcy won the SS job. But it's all about getting on the field and it looks like Williams will be able to do that, behind a group of LBs that I think has a few question marks.
I know the history of that position is good, but I don't know if there's elite DB1 type upside with Williams there. I could see strong DB2 numbers, and I think Jene suggested in his preseason notes article today that he could be a Manning/Jenkins/Quin type. That's not all that exciting, but it's enough to take a shot I think, as that's a pretty good floor, with possible potential for more (and good value for a guy you might roster as a DB4/5).