That would make sense for Wei to say something like that as well as to make sense to master the other elements before tackling trying to learn Air. He'd try his best to convince them to teach him, even if he has to wait a bit before he can learn Air from them.
This is true. Rae and I spoke about having Mei and Zolan meet each other in the forest before they'd head to Ba Sing Se when it was just the two of us before others joined. This can always be changed of course to where everyone's in Ba Sing Se and one thing leads to another, and welp, plot time. XD I was thinking Earth would be the first element to be unlocked. Just a wall of stone appearing in front of someone to protect them, him having no idea how in the world he did it, it just happened. If you want Wei to come in later, that's also fine. Considering Air would be so far down the line, you could make another character be part of the story sooner if we don't go with the idea of everyone being in Ba Sing Se already. Even then, Wei can be on the fence about teaching him and telling Zolan that before he learns Air, he must master Earth and Water first. Not to mention Fire still. He only knows the basics of that since he had no teachers and had to train himself, much like Katara did.
This 13-year-old has it cut out for him. huh? XD But yeah, I think that would be an interesting thing to tackle as the story goes on. Yet another reason for people to come after Team Avatar. That said, we should probably make some villains for these guys to encounter on their travels.