Again, a Power Rangers (2017) question.
We are told (by both Zordon and Rita) that there are forces in the Universe who want to possess the Zeo Crystal.
Thus the Rangers' main mission is to protect it.
But when the previous team died and Rita got blown into the sea, there was no one left on Earth to protect the Crystal until the new team was formed in modern times.
Are we supposed to believe that no one came for the Crystal for 65 million years? No one wanted it except for Rita? Why?