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[avatar] why did ozai not wait for iroh's to return home?

why did ozai not wait for iroh's to return home, and then both went together to explain the whole situation to azulon? i'm sure with iroh supporting the decision, azulon would have let ozai be the next fire lord.
gpt
Ozai didn't know that his brother wasn't interested in the throne anymore.

Ozai didn't like his brother very much, seeing him as weak for being so loving and emotional. He didn't understand those characteristics and was also envious of Iroh since childhood. 

He would never even think about advocating the throne if he was in the same position.

Ozai was 100 percent trying to backstab his grieving brother.