Massive spoilers...

And at the time, the racial-mix expecting couple probably had more resonance in the mixed-up morality and priorities of the MCs. They are the humanizing elements, reminding the eggheads, what it means to be fully human -- to love, to survive, to defend and reproduce. In the end, leaving the purloined jacket with her, was just about as poetic as it can get -- "Most people don't know Marilyn had narrow shoulders too..." Ha ha, love it!!