You know, given what fandom did with Gaila in the last film, fleshing about three minutes of screentime out into a lot of wonderful fanfics and a multilayered character, I'm sure there can be a lot done with Reboot!Carol Marcus, especially if one likes her already. (This is my subtle way of encouraging you to write said fanfiction. :)
re: Khan and all the issues, I think with some rewrites the film would have worked if BC had played someone who truly was John Harrison, Kirk's contemporary. His crew would still have to be there, of course, to create the parallel with Kirk. Perhaps they all were secret experiments by Section 31 (since genetic engineering is officially illegal, but Section 31 canonically likes to break the law and use Genetically Engineered people anyway)?
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re: Khan and all the issues, I think with some rewrites the film would have worked if BC had played someone who truly was John Harrison, Kirk's contemporary. His crew would still have to be there, of course, to create the parallel with Kirk. Perhaps they all were secret experiments by Section 31 (since genetic engineering is officially illegal, but Section 31 canonically likes to break the law and use Genetically Engineered people anyway)?