Your people library — add or import everyone in your deals, then map who really decides. These contacts power the org charts and the 4 P's.
Nobody is set up to receive leads, so new enquiries have no owner.
Where a rule leaves a choice, it goes to whoever has the fewest open leads — not at random, which is how one person ends up with four in a row.
Nothing is ever left with no owner. If no rule matches, it goes to whoever is free. If everybody is away, it still gets a name, so it appears on somebody’s list instead of nobody’s.