I didn't say they had immunity. I said it's reasonable that they do. And you have no basis to claim for certainty that they don't. Thus, you don't know that they don't.
It does follow that they are different and that some different rules apply. Quite possibly, the human rules.
I refuted one point of yours. I called your other points into significant question that you can no longer say that Helo definitely can't be a Cylon.
They are already significantly different. You can't just draw an arbitrary border on what point you think makes them being one of the 12 models is irrelevant.
All I'm saying is that the final five are different. Thus being different, you cannot say they have to follow the same rules as the original. Thus, you can't say Helo can't be one of them because he doesn't follow the same rules. I'm not saying they don't follow many of the the same rules or this particular rule. I'm saying you no longer have any basis to say that they do.
All I was doing was calling into question. With it called into question, Helo is then a possibility.