@blockeater yes here is my idea,
a fighting scene between sanemi and giyuu and akaza, they fight with giyuu have major injuries and sanemi alittle but then akaza took sanemis sword and broke it, akaza it sanemi with his compass thingy, giyuu does dead calm. Sanemi fabberglasted by giyuu, giyuu takes sanemis sword and stabs akaza to a trunk, just as:
Choice 1: sun comes out
Choice2: akaza some how escapes
Giyuu passes out and sanemi takes him back to the room to treat him and sends crow to inform hashiras and the master. While sanemi is treating giyuus eounds hd sees the sh scars/cuts and a a letter in his pocket. Out of curiosity he opens the letter to see a picture of him and his parents, a picture of him and his sister and apicture of him and sabito and the formal water hashira. And that is all i got for now