Hun is the last person Stockman would work for willingly after all Hun is the one responsible for Stockman's current situation. besides stockman is suppose to still be in the employ of Bishop, well lets see.
This episode was fun if you look past the continuity errors I liked Shredder taking over Stockman's body and his makeshift Shredder suit he put together in a minute. Shredder begging for the Turtles to help him was fun. Yet I still can't look past Stockman A working for Hun willingly, working as a criminal and not working with Bishop. Something is wrong here, a plot hole, a huge one.
It had some good dialog, Mikey was less annoying and it's starting to look like Leo Raph and Mikey do care about Splinter but they realize they still have to deal with the outside world to. That Yeah Splinters gone and they can save him but if they focus all their time on splinter like Don is doing the side will be destroyed and splinter would not want that. Raph had a good line about them being the worst ninja ever, Stockman's bickering was fun too.
Still I have to give this episode a 3/5 for the errors I can't over look. maybe something happened in the year the Turtles were gone that got Stockman out of Bishops employ and what not, but i can never see Stockman working for Hun Willingly and for those to act civil with each other? No way.
Oh my guess is karai leads the normal foot soldiers while Khan leads the "Cyber" foot.