I also feel the need to note the deal with his grand father I have him set to be ambiguous as I feel I can possibly use him for personal growth, or to justify his air bending if needed. His grand father isn't made to be anyone truly big unless you feel like he could be later on. I just feel I could use the two npcs to help along with some possibly interesting stuff in the plot, and can drop, or add more to them if need be.