A few points:
1. It's always admirable when they keep a plot hook going for almost one and a half seasons before letting the other shoe drop. I admire the restraint and the patience, and it heightens the emotional impact of the betrayal. It's especially twisted when you think they had thrown a goodbye party for him and within a day or two the crewmen at that party were getting slaughtered.
2. The obvious reason why Isaac has blue eyes and the others have red eyes is so that the viewer can distinguish him from the rest of his species on-screen when he isn't alone. I wonder if they'll provide an in-universe reason for why that is, but ultimately I think it's just for the viewer's benefit.
3. The Orville is ultimately an optimistic show, not a cynical or dark one, so I would put my money on Isaac saving the day in dramatic fashion. I think the crew would take him back if he either sacrifices himself, saves the kids, or destroys most of his own species in an effort to save his new friends. I think I'd be prepared to forgive him if he was willing to go to such lengths against his own people. Ultimately, it was the crew who decided to go to Kaylon, not him. They had clearly already decided on invasion when Isaac was deactivated - they alluded to the fact that a binary decision was an easy one for Kaylons to make.
4. However, I'd have to give the show a massive amount of credit if Isaac does not turn out to be the good guy. There's sort of an interesting lesson where the crew (and the viewers) anthropomorphize Isaac reflexively and almost unconsciously, attributing his behaviour and actions to some deep-seated, hidden emotional capacity. Meanwhile, he's usually brutally honest when he continuously states that he's only doing things to gain information about biological life forms. Is he actually feeling anything or is it simply wishful thinking on our part?
Ultimately, the relationship episode with the doctor seems to indicate that Isaac had a form of attachment that we equate as love because he operates more efficiently with her around. So as I said earlier, all signs point to him turning the tables on his people.
5. I'm willing to let a few details slide in the interest of expediency. Yes, it was kind of silly that the kid was able to freely travel around the city, and accidentally found his way into the catacombs to find millions of biological remains.
You can sort of explain it away by realizing that the Kaylons are ultimately about efficiency and since no one visits their planet, there's no real need to have extra security or have the remains hidden. You might expect them to post a sentry by their ship, but again, you could argue that their superiority complex inhibits them from regarding the Orville as any kind of threat whatsoever. Using the ant analogy from above, do you post a guard for ants or do you simply wipe them all out when they become a nuisance?
6. I liked how easily the Orville was dealt with when it first arrives on Kaylon. It really drives home the discrepancy in technological capability and might.
Canadiens Ghost said:
If the Kaylons intend on wiping out all organics, why are they keeping the crew of the Orville alive? They serve no purpose.
Having a few hostages around never hurts.