So the Plane-Hopper's Handbook introduces some eidolon types that my players wanna use in Organized Play. One of them wants to evolve a radiant eidolon to be a mount. This is troubling because the radiant eidolon isn't listed under the mount prereqs. In fact, none of the P-HH eidolons are listed under any of the unchained evolutions, likely because they came afterward. Who gets what?