All we know of Kuruk is that he had a team to train him they split up

And that his love got token from koe and he thought dark spirits

@Spacechorus

Not true at all.

He spent his life fixing all the mistakes Yangchen made. She let the world get flooded with evil spirits, kuruk had to destroy them all.

Plus the only thing we know of szetzu was that he was extremely biased for the fire nation, he was a politician for them and ignored everyone else.

Roku was alright but his failure to confront Sozin early on lead to the 100 years war

He was blinded by loyalty to his former best friend and it cost him.

Kuruk was careless but he did a lot in his life and saved the world at the end if the day. He wasn't really lazy he was just exhausted from the pressure

@VolcanicMasochist you got a good point there.