Back then, Dyon refused to feed the Fate Breaking Pill to Ri because doing so would essentially reset her bloodline, wiping out her elven lineage. Dyon had always felt that this wouldn't be a worth it.
One had to remember that relying of Faith Seeds cut off one's path. To make matters worse, if Ri ignored both her elven lineage and her Faith Seed, just the talent of her Snow Clan kitsune body likely wasn't enough to follow Dyon to the Immortal Plane.
This sort of reality was unacceptable to Dyon. Plus, back then, he hadn't seen anything wrong with the existence of the World Tree at all.
However, the Dyon of now wasn't the Dyon of back then.
Before, Dyon could only refine to Fate Breaking Pill to 70% purity. But now, refining it to several times strengthened levels was as easy as breathing.