I thought Bell was going to get Cam killed in a few games last season, like when he gave up in the Bills game. He flat out gave up. He wasn't even lined up properly, and wasn't using any technique. It was stunning. But then there were other games where I thought he did a nice job and looked fine. The slower the DE, the better Bell tends to look. The problem is that he dosn't back up quickly enough or properly sometimes imo. I think it's because he's clumsy and sometimes looks very fatigued. It makes him sloppy. If you're too far back, or not far back enough and you're not anchored the DE is going to make you look silly.
I actually think Williams should be able to beat out Bell for the RT spot, but Williams isn't much better. I think Willimas is quicker and has, or had, better technique.