It is said that you should KILL not witness, KILL the one closest to you to obtain it so when you make your opinion make sure you do not distord the truth from the theory thank you... In this thread however we speculate on how witnessing his close friends died MIGHT have triggered his MS but it is not anything that has been said in the story line. Other than that detail what you say makes sense. But really don't induce people into thinking that witnessing in contrast of KILLING is what has been told in the manga.
@Nikkou Arashi: Kakashi can copy techniques that are not too complex (he couldn't copy rasengan for example he had to learn it, as well as raikiri, it is not copyable it has to be learned thus why Sasuke spent soo much time learning it. Techniques that uses seal are his favorite to copy.
And if he had copied Itachi's MS then he would have either tsukoyomi or Amateresu which he never used maybe he has them both? he never showed it though. But then again if a three tamoe sharingan could copy MS then a whole lot more uchihas would have had MS it was already said in this thread but I won't hold it against you like you said... it has become a long thread

Keep it going guys !:T_T: