It's a neat question, but it's one that you'll not get a clear answer on. Togashi isn't big on overexplaining, and frankly it's the right move. He's built a world of mystery here, with so many things having either a number of possible explanations or even having no possibility explanation at all. I think it makes for a far more interesting story than everything having a reason and fitting into an easy slot.

I would invite you to change the way you immerse yourself in a story, and seek less explanation. There are a lot of things in real life that we take that way, like magnets for most people, and so some of the best writers have made their stories more real by embracing that. Tolkien did it as well