You probably don't. Especially when you run into the same issue that many stories with multiple pantheons hit, which is each group being born from then killing the same being. How many ways have the Earth and Sky been overthrown, and in how many different ways? Trying to cram all of them into the same single event is bound to create way more issues than it would resolve.
Binged All Of Gundam In 4 Years, 1 Week and All I Got Was This Stupid Mask
FF XIV: Walked to the End
Started Legend of the Galactic Heroes (14/07/23), pray for me.
I mean at that point you could say the real curse was on the Tohsakas with their goof up trait.
Toosaka’s goof ups never rendered the Grail mostly unusable for all subsequent wars, so I think the Einzberns screwed up worse.
tohsaka goofups are tied to the land, it just combined with the cursed einzberns to ruin everything even worse
The Tohsaka goof ups are also comedies like summoning your future boyfriend or leaving Gilgamesh unattended in a wine cellar. The Einzbern's are more like "turns out summoning Persian Satan was a bad idea".
"We have entered an infinite recursion of Saber."
Actually, hiring the guy who's specialised in killing magi, who's tied to their household by marriage and genuine emotion, for a magus battle royale, was the best idea they've had in a few hundred years.
But they'd already fucked up by summoning Basically Satan into their wish granter, so that every time they rolled that particular gacha they'd unveil the trap card that kills everything on the field.
FGO Supports
Yeah, the only reason Kiri didn't work out was because they had already screwed up the Grail by summoning Angry Mango during the 3rd war and having him corrupt everything. Had that not happened they probably would've gotten everything they wanted after the 4th HGW was over.
Heracles was a great idea but Berserker not nearly as much. Archer would be much more advantageous because
A) It’s an overall better Servant.
B) It would leave Rin with Berserker EMIYA, who would get himself killed in the first opportunity by running into traffic to help an old lady cross the street.
Tohsaka getting Gilgamesh and Gilgamesh being hilariously stronger then every other servant kinda blew up their plan. Even then if Kerry hadn't taken the sheathe so he could go fight Kotomine Artoria would have been in with a shot. Getting the loyal magus killer, King Arthur as Saber, and Avalon for bonus power was hardly going into the Fourth War with a bad plan. With the sheathe Artoria probably rolls over most of the competition.
"We have entered an infinite recursion of Saber."
In addition, the Einzberns clearly ignored any issues of Master-Servant compatibility when they paired Kerry and Artoria. As Kerry himself said, he would have much preferred Caster or Assassin.
Also, Berserkles does make some sense, since he's less likely to turn on the Einzberns if he finds their intended use for Ilya to be unconscionable. The man can ignore Command Seals for gods' sake.
The closest thing to a guarantee in a war is an invincible juggernaut that can roll over opponents, can't be killed, and won't ever go against you.
We saw how well that worked out for them in the fifth war.
FGO Supports
The Einzbern's real problem is that random teenagers keep interfering and throwing off their gameplan. Imagine how well they would have done if Saber hadn't gotten bullied by Iskander and if Berserker hadn't been made to face up against Saber, Archer, or even Shinji (and some other guy).
"We have entered an infinite recursion of Saber."