So with only one jutsu, he manage to take care of 7swordsmen? :shrug:
Ok, as i said, either Kakashi is superman, or they are only a piece of cake.
Anyway personnaly i don't think he didn't use jutsus(it humiliates really the power from the 7swordsmen+haku+the 2other guy with KG). Don't forget he said before that "the one who copied thousand jutsus is about to go on rampage". If after that he didn't use jutsu, it would be really funny.

Also, when we have seen him later he managed to defeat Kisames master with a lightning blade.
And yes he said he lacked of stamina(to himself no to Guy Btw), but after 2days in fighting continually it's normal. Neji couldn't even stand one day and get healed. Even Gaara and Mei were also tired as i've seen them. They were healed by Tsunade, and others too.
It's really incredible that he can even fight after 2days long. And eventhough he doesn't have many chakra left, he managed to cast a clone and use lightning chain and continue the fight against 5Bijuus. Epic