The rank walk stays sovereign over neither. Membership defines the electorate of a scope; rank orders it; coreference resolves who was speaking. Rank first among equals only because it exists and works. This edge is bookkeeping, cast so the new items connect to the component.
Rank stays the senior relation: containment defines electorates, rank orders them. Nothing in this proposal touches the walk. Bookkeeping edge to bind the new items into the component, same as last time.