Zuko and Jet work together very well when it comes to stealth missions, so in that regard, he'll probably be an asset...but he might want to do more damage than Katara and Zuko planned for. Especially he'll have the hots for killing Yahn Rah, which would complicate matters.
On the other hand, he is still recovering, so who's saying that Katara and Zuko are taking him along? And boy, it'd be nice to watch him flounder and try to adjust when suddenly things between Zuko and Katara are running smoothly. He'd probably resent that quite a bit and he'll have a hard time figuring out what to do about it. Once he does though, Zuko and Katara'd really have to watch out!
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On the other hand, he is still recovering, so who's saying that Katara and Zuko are taking him along? And boy, it'd be nice to watch him flounder and try to adjust when suddenly things between Zuko and Katara are running smoothly. He'd probably resent that quite a bit and he'll have a hard time figuring out what to do about it. Once he does though, Zuko and Katara'd really have to watch out!
^_^