Been thinking bout this for a while now. How is the Sharingan able to allow the wielder to use different element types? e.g. Kakashi can copy anyone he fights. From what I can gather, Kakashi just copies his enemies hand signs and then recreate the techniques. It was mentioned that a Ninja can only use techniques related to their element types. That's why Kakashi said he couldn't teach Naruto his Raikiri technique cos he was not a Lightning type.