Even if my brain could ignore the inconsistencies of them asking why she's red, there is no way I can make up excuses for the "Race of Impossible odds" like you mentioned, or Nojiko being so concerned about their "weird" relationship or the fact that them, two completely unrelated people, could not make out in front of Vic and Mila, or the subsequent conversation before getting to the pizza place.
It just doesn't add up. I'm sorry but as it stands, I have to reiterate. There is only one way the dialogue makes any sense. On this hill I would die. Any day of the week.
I agree with you on the whole about their reactions not making sense, but the line about being red? The script literally points out they have different parents at that exact point. In normal english, we'd understand that the stress on 'her' parents vs 'your' parents is 100% clear when mentioned sequentially, especially followed by 'they' 'and (what about) Nami's?' It'sclear what the script means there.
za "Why is she red?"
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d "That you'll have to ask her parents."
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za "What happened to yours?"
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d "They died in a car accident."
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za "And Nami's?"
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d "Believe it or not... The same."
So... believe it or not, the line here with Zara shows that the race against impossible odds doesn't make sense, their behaviour doesn't make sense, not their history. It's the same as when everyone thought they were a cute couple. The script makes sense, Nami and Nika's reactions don't.
Besides, given Nami's porn habits, if I were Noji I'd be worried about her weird relationships ALL.THE.TIME.
How Ocean reconciles their behaviour with their history, well, I'm as keen as you for it to be cleared up and neatly explained. Based on the current script, it is their hangup that is th oddity.
And if they are ralated at the end? Maybe both lost their parents in a car accident because they are siblings and for some reason someone don´t want them to know so they have been raised as roomates
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Everyone is SG knows and obeys the ToS that Ocean operates under, so I can't see how Nika or Nami would be so disrespectful to Ocean. Maybe that's a deadpool style fourth wall breaking - Nika and Nami know Ocean is against them!