It seems that his actions did not cause the Great Epiphany alone but changed the world itself. Oriole washed the dishes as he explained his theories, including the butterfly effect, where he proposed that the change in the timeline dated back hundreds of years.
"Runera wouldn't have existed without us," muttered Arthur with a frown. "However, it seems the memories that merged with the other world worked as an epiphany to how it was shaped. This made the timeline retain its basic structure."
"However, there are a lot of differences," muttered Oriole as he closed the water. "I did not realize it when I awakened, but the memories I have of this world are a lot different from the ones I used to have."
"It is a different timeline," sighed Arthur. "I wonder if I chose the right thing by destroying the previous one."