kakashis ability to use mangekyou
hah i think i just realised why kakashi can use mangekyou sharingan when Rin transfers Obitos eye to Kakashi he dies right well like itachi said to unlock this power your best friend must die
ok Obito was his best friend and when he had the eye implanted obito died
and maybe the reason he couldnt use mangekyou sharingan yet was cause Kakashi didnt develop it yet
wow ok if yall knew this then nvm