In this episode, we finally know that Sokka is not just an addition in the group. Even Sokka could prove himself as a good warrior. And the best thing is Sokka got a new sword. Unfortunately, we don't know the detail of Sokka's learning progress. example, we don't know how many days Sokka has been trained in Piandao. I think Piandao gave one lesson and one test for one day. So, Sokka has finished it in a few days.
The best part is the fighting between Sokka and Pi Yan Dao. As we could see, Piandao was motivating Sokka while he was fighting him. A strange method. However, this is the best non-bending fight in the Avatar TLA show. And actually, Sokka's friends need him very much. They are nothing without Sokka.