So, I have this weird Ninjago Headcanon...
It’s pretty small, and doesn’t really change much in the scheme of things, but I thought I should share:
The First Spinjitsu Master created all of Ninjago, right, and presumably that includes the people. So my headcanon is that he had a very specific process for creating humans. It started with him building their bodies from Earth to make them strong and hardy, creating their minds with Ice to give them clear thoughts and bright minds, then putting Fire in their hearts and souls to ignite their passions, and finally Lighting to shock them into life.
That’s why those Elements were singled out at the beginning of the series, even when others could arguably considered more powerful. That’s why those were the Elemental Masters destined to guard the Chosen One, and that’s why those were the four Elements that make the Tornado of Creation, because those were the Elements used IN creation!
Or at least that’s my two cents anyway.