Should Catra join the rebellion, and have Vilgax take her place on the hoard?

Or

Stay with the Horde?

Or my idea, have her stay in the Horde for the first two seasons before deflects for reasons I can't say right now, and goes to Y/N for protection

Aliens I might add

Also, should Y/N have only three girls in his harem or should I add Mersista?