People are also forgetting that while Marco is offering to take Zoro to the roof, he's also likely doing the same for Brook/Robin. The translator couldn't translate the following bubble, but the one after that has Brook concerned about leaving Chopper, indicating Brook and Robin are also leaving the area. Either with Marco or to the mansion.
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In this chapter, Marco singles out Roronoa right? So... seems like he's taking Zoro to the roof.
Again, you haven't addressed that in your scenario, you are changing people's motivations without much prompting
He doesn't. The dialogue got cut off. Brook is concerned he's leaving chopper. Go back and read. Very likely he plans on taking all 3, or at least tells them he'll take them somewhere else. He mentions the strawhats in that missing dialogue, but the rest is too blurry to read.