No they don't. GSC has rights for the Figmas and Nendroids and such, but they do not own BRS in any ways. Just like everything they create figmas and figures for. They're basically just a toy company.
You asking about hammer space when Stella's taking out weapons out of nowhere that are twice as big as she is? Also Stella's mid to end game gear all belonged to Nana when she was younger. Nana even makes a comment on the size of the shorts.
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2) No civilians. Their presence might have made the story longer.
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That's because they're dead. In the mission where they go to Moscow, they go there to find Nana because she's literally the last woman on earth.
And considering dialogue at the end of Stella's movie, and also the fact that when she wasn't fighting in the opening she was alone and sad, that gave it away months ago that pretty much everyone was going to die.