its just embarrassing when you make a fandom related post and it doesnt get any notes like okay. so no one want to play tuoys with me. no one wants to play with our little guys together. okay thats fine. yeah its cool... puts my hands in my jacket pockets. kicks a beer can that was on the side of the road a little
so,, yeah
[id: the first image is a screenshot from an anonymous tumblr ask that reads "was thinking about your ninjago = rainbow dash post and was suddenly flashbanged with the mental image of that one painting of jesus holding a lamb but its kai holding the rainbow horse".
the second image is a redraw of a painting of jesus holding a lamb in his arms in front of a beautiful landscape, but drawn in his place is kai from ninjago holding rainbow dash in his arms with a soft glow around him./end id]
"I found something new that I'm really good at. I'm a ninja"
So Cole was saying this after Lou caught him going over the plan to steal the Blade Cup with the other ninja.
And here is Lou's face right after Cole said that he was a ninja:
And later, Lou says to Cole in reference to how stealing is wrong, "I'm not going to wait around to watch you make a mockery of our of our family's legacy."
And I know that at the time the episode was written, Lilly most definitely wasn't conceptualized, meaning that her being the previous Earth ninja couldn't as well.
But watching this after Season 13, you can interpret Lou's reaction to Cole being a ninja and stealing, as not only a mockery to his legacy being a dancer, but also Lilly's legacy as being a ninja.