I love AtLA as much as anyone, but yeah it is, uh. Pretty abundantly clear that the White Lotus didn't exist in the writers' room until at least season two, and they didn't have a full idea of its role in the narrative probably until season three. The timeline on Iroh "Did A War Against All The Rest Of You" Azulonson joining and being trusted so high in the membership is also. Very questionable.
Which is all to say I think it would be perfect if we got to the season three end game and realized Iroh was actually still an errand boy initiate in the White Lotus. And Piandao pulls aside the main tent flap to reveal our Supreme Grand Lotus:
Canonically traveled the world without Committing A War, thus reasonably having met and networked with most of these other people in a positive way? Check
Saw the Avatar and told her only grandkids to go help that kid ASAP, don't worry Gran-Gran's just going to stay riiiiiight here while you're gone and definitely not relive the excitements of her youth? Check
Would recontextualize Pakku's constant sour grapes face (and his reaction to seeing Katara's necklace) to "my ex left me and now she's my superior, if I don't train her grandkid she will mobilize a global movement to Kick My Ass"? CHECK
Gran-Gran for White Lotus Grandmaster 2026