On low honor she said that Arthur was like a friend to her, and on high honor she said that he was the best person she knew. This can be understood in different ways, but perhaps you are right.🙂
Damn Arthur's life is very sad and emotional When Sadie says my memories of him are pure, Arthur says i ain't even got that implying that he doesn't even have pure memories of his good old days with his partners(Eliza and Mary) (Maybe he's forgotten the memories)