Shared ground on bathroom light, fan, heater combo
Connect all ground wires together in the light/fan combo. Ground paths often parallel, like anytime MC cable is used, a ground wire is pulled into a conduit, or a metal box is installed on a metal stud.

250.130(C) only applies in conditions of the paragraph ahead of it, where it refers to receptacle replacements and circuit extensions of existing circuits (that were initially installed prior to a grounding conductor being required).