Eh, I think this one works much better because it's not explicitly religion. Just a wrong cultural value.
* Ed does talk about how the fact they're not born under the same sign and then realizes that the leader DOESN'T CARE. They only use astrology to control the masses and having studied the union, realize their control would be utterly borked if they let people contact other civilizations. It's just a way to break off diplomatic contact.
Agreed this would've made more sense. Call out the evil leaders like what they did in "If the Starts should Appear" and "Mad Idolatry," show that they're really power hungry demagogues. IMHO the two best S1 episodes.
A better plot: Let Ed pull an Alara by ignoring Admiral Ted Danson and stage a covert rescue for Kelly and Bortus. Had Isaac investigate potential frictions among the Rigorians and use them as informants for the rescue mission. I think it's a better escape plan rather than having Kelly and Bortus pulled a Rambo and killed appx. two dozen guards in their failed rescue attempt, a scene that has been pointed out by many reviewers to be ethically dubious and very un-Trek like.
* First Contact! The Orville arrives...and so does the Krill.
Would've been a nice plot too. Too bad they already have an encounter with the Krill episode last week...
* The Orville meets with the populace and finds out they have a dark secret. Maybe it's something a little less crazy like kidnapping Kelly but the fact they practice slavery (perhaps under the same astrological rules).
Aren't the Gilliaks in the prison camp treated like slaves already?
* Ed royally fucks up First Contact somehow due to his habit of being a judgemental prick.
That's exactly what happened in this episode IMO. Ed is the second weakest (after Gordon) character of the show. He has neither the wisdom and diplomatic skills of Picard nor the tough, street smartness of Janeway. From the way he runs his ship I can see why the Orville is a middle average Union ship staffed with second and third-rate crew members, although in fairness it seems many other Union captains seems to be worst than him.
* A plague spreads through the planet until we discover it's not from the Orville (which would be too dark) but terrorists who don't want First Contact.
Basically a repeat of Season 1, Episode 8 episode where Claire, her kids, and Isaac got stranded in the 'Walking Dead' planet.