<Snipped quote by Etcetera>
But even if the ratio if Paths to Sources is 1000000 to 1, there are still an inexpressibly large amount of Sources. In combination with how many times Sources have reset over however long Existence has been a thing, how many times Paths get screwed with by Tier Fours, and how much can be done over the "lifespan" of a universe, I'd say just about everything short of extra-universal events have happened.
What? Sources don't reset; they advance and continue forever. There aren't enough to account for everything that could happen, especially since they all start at zero, and they don't all contain the same amount of information. Logically, there are infinite outcomes, but a finite number of universes.