Originally Posted by
Carabas
Okay...
First rule about Flash style time travel: where we're going, there are no rules.
Second rule: if there are rules, they are on a delay. Usually. The new tile line needs time to set, time needs time to catch up, that kind of thing.
Third rume: Eobard has his own, seperate set of rules.
Fourth rule: the Legends also have their own seperate rules.
So, Savitar. Boled down to the essentials, he's basically just a bootstrap paradox with issues.
In his war against Savitar, Barry creates an army of dopplegangers, thereby accidentally creating Savitar, so basically there never was an original cause, it's justa stable time loop.
Double!Barry gets created to fight Savitar, turns evil because Original!Barry and all of his friends are assholes, Double!Barry vows revenge, and traps himself in the speedforce, from where he can influence things thoughout time, and into the distant past sets up the Savitar identity.
As per usual not understanding what is going on, team Flash releases Double!Barry, now with funky speed armour, from the Speedforce, and the war that ends up creating Double!Barry begins.
And then Barry stops that war early, Iris kills him, and he fades into nothing as the paradox become too undone for even the rules of Flash time travel to just ignore it.
Or something like that.