THIS IS SO GOOOOOOOD GOOOD JOB SERIOUSLY I LOVED YOUR MUSIC AND YOUR ANIMATION TOO!!! IT'S SO NICE AND STILL STAYS FAITHFUL TO THE SONG!! I SAY THIS AS AN IDOLATRIZE WORLD ENJOYER, CONGRATULATIONS
Zun confirm up to Touhou 15, Hecatia the strongest as Goddess that manage both Earth (Gensokyo), Moon (Lunar Capital) and Outer world (Outside World where Sumireko come) Also no one seems stronger than her after Touhou 15 so I don't think anyone were stronger than her. Even Watatsuki Sister still below her The only possible person that could be stronger than Hecatia is Hakurei as God of Reality that make the Gensokyo itself. The speculation of Hakurei as God of Reality is because Hakurei Orb that store Hakurei's power have Reality bending power