Board Thread:Theories and Speculation/@comment-34656247-20180531072459/@comment-6769189-20180617103242

I checked the reference. Unless its just the translation im reading, it doesn't talk about how the curse marks work, just that Orochimaru figured out how Juugos powers work and that his body was too weak to handle sage mode.

Tsukuyomi would trap Obito in it but Sasuke would have to actually control the genjutsu. It requires conscious thought to continue after it is activated, otherwise it would deactivate right after it activated where-as Amaterasu keeps burning after activation.

Amaterasu does spread. After Itachi died the whole forest around the Uchiha hideout was on fire. Sasuke also didnt really dodge it.

Itachi worked with Obito but didnt know about his abilities or how they functioned. IIRC Obito stated Itachi didnt really know his abilities or at the very least, how they worked.