Something I've only recently noticed, is that Aang plays no real role in the outcome of the Siege of the North. If he wasn't there, and Zhao killed the Moon Spirit, Yue would have still sacrificed herself, the Ocean spirit would go into a rampage to win the day, and only stop with the resurrection of the Moon Spirit. It's just like how without Indiana Jones, the Nazi's would have still found the ark, open it up, and all die. And don't tell me the kid merged with the Ocean Spirit, the Ocean Spirit is powerful enough to not need the Avatar.
How would you deal with this problem if you were the writer for the Netflix reboot?