Case in point:
This panel pairs Billy with Braves pitcher Carl Willey. I must admit that I'd never heard of Carl Willey. A look at his page on Baseballreference tells me why. Over his eight year career, he was 38-58.
Of the two panels that feature Billy Williams, the Willey panel is the easiest to find. His partner on the second is a Braves pitcher with a little better record, fellow Hall of Famer Warren Spahn. The Williams/Spahn panel is both harder to find and more expensive. It might be a while for that one to be added.