Going by feeling and not by statistical accomplishments...
Chancellor / Lynch is a tossup for me.
Love Bobby, but between he and Beastmode... one could make the srgument that a slightly lesser player could have fit Bobby's spot and we'd still have been successful. By slightly lesser, i mean KJ lesser.
Love Jones, but his work was done in the closet, quietly.
But Beastmode and Chancellor. Their play and impact was seen and felt game to game. In big moments, in small moments.
With both, if you take either away, we arent the same team. We dont even have remotely the same history, legacy, reputation. The two of them created the aura around the team that the league feared. And thats not to take away anything from Walt or Bobby.
They were just the sparkplugs that made everything go.