So. A battle to end the Fuyuki Grail Wars. Maybe I haven't been looking, but I haven't seen much speculation. Ten years after FSN, a conflict just as big as the Heaven's Feel. On one side we know there is Waver and Rin. Probably Shirou as well if he's around.The taking apart of the Holy Grail War.
Ten years after the Fifth War. Lord Emelloi the Second (real name, Waver Velvet. One of the Masters of the Fourth War) arrived in Fuyuki and together with the head of the Tohsaka line, set out to completely take apart the Great Grail. The Association was planning on bring back the Greater Grail, so the two sides were completely opposed. After the end of the great turmoil of the same magnitude as the Grail War, the Greater Grail was completely dismantled. The Grail Wars of Fuyuki came to a complete conclusion here.
The other side would be the Association, definitely the Einzbern, and definitely Zouken. Now I don't see Waver and Rin winning that fight even with an UBW Shirou, unless its the Good End and Saber is there. So I imagine there must be other allies. Perhaps the Barthomeloi? Since the Archibalds are connected to them.
Anyway, discuss this apparent conflict that perhaps should spawn its own story and definitely fanfiction. Why has such a sweet scenario not spawned any fanfic anyway?