Naruto is... well Naruto. He has the Nine-Tailed demon, what more do you need?
Sakura is great with Genjutsu, has inhuman strength, and has the medical knowledge of Tsunade-Sama.
Kakashi is the son of the White Fang of Konoha. He has the Magkenkyo Sharingan and has the ability to send things into another dimension with it. Not to mention that the basic abilities of the Sharingan would overwhelm team Aang, such as the ability to use hypnotic suggestion like he did against Zabuza.
Aang owns naruto because now thats he back in sage mode he had resealed the ninetails and can’t use it anymore, Katara owns kakashi because ... i mean he can’t even get close to her. We all know toph owns sakura cause sakura sucks, so team Aang takes this no problem. i mean Aang could just go avatar and kill them all.