Regarding the Elinor-Marianne-Elinor emphasis in each volume, and the home-away-home locations, I agree with it all. There's no implication intended, as to whether you deserve the compliment of rational opposition. ;-)

If you stand back from the plot and squint at it, the Elinor-Edward-Lucy situation is a love triangle where the undesirable element gets tempted away by a fourth person. The same goes for the Brandon-Marianne-Willoughby situation. (The EEL and the BMW.)

There's also an orderly procession of characters turning up for a tête-à-tête with Elinor and revealing personal information to her. Sometimes it's even the person's own information! The earliest one I can think of offhand is Mrs Jennings on the subject of her husband's final illness, and since then there've also been Lucy, Colonel Brandon, both John Dashwood and Robert Ferrars about Mrs Ferrars's doings, Anne Steele with the results of her eavesdropping, Mr Willoughby at Cleveland, and Marianne sorting herself out in chapter 46. We just need Edward to come clean about things in next week's chapters, and Elinor will pretty much have collected the whole set.