Board Thread:General Discussion/@comment-30841289-20161230001419/@comment-34163988-20180208205941

NinjagoLover52 wrote: Remember how elemental powers can be pased down by blood line? It has to have something to do with blood.

Morro and Cole still had their powers when they were ghosts, and ghosts don't have blood so it might be something to do with their spirit or something.