I've never really liked the secondary canon JKR gave to Minerva, but you managed to make it work very well in this fic. Elphinstone seemed to exist to give depth to Minerva and Poppy's relationship--something that was always there, but over time became subtler. What I truly adored was how you placed Poppy in a position of knowledge within the Order. She's so unappreciated, and I'm glad you gave her an important role in the War.