Never paying a great deal of attention to it, I don't think I fully understood it. As Line indicated, it is a significant point. I think in the past I didn't get that Darcy was hoping that Bingley and Georgiana get together. I find it rather odd that so many people were trying to plan their friends and family's lives by direct action - physically separating a person from someone in hopes to make them be with someone else. Is it also not interesting that it was so quickly apparent to Elizabeth that Bingley did not distinguish Georgiana in any way? I wonder that Bingley didn't try to make Darcy interested in his sister Miss Bingley?